diff --git a/modules/openapi-generator/src/main/resources/rust/reqwest-trait/api.mustache b/modules/openapi-generator/src/main/resources/rust/reqwest-trait/api.mustache
index ff3d54ddcc2d..c11fed0ac474 100644
--- a/modules/openapi-generator/src/main/resources/rust/reqwest-trait/api.mustache
+++ b/modules/openapi-generator/src/main/resources/rust/reqwest-trait/api.mustache
@@ -206,11 +206,8 @@ impl {{classname}} for {{classname}}Client {
         {{/isModel}}
         {{#isMap}}
         if let Some(ref param_value) = {{{paramName}}} {
-            let mut query_params = Vec::with_capacity(param_value.len());
-            for (key, value) in param_value.iter() {
-                query_params.push((key.to_string(), serde_json::to_string(value)?));
-            }
-            local_var_req_builder = local_var_req_builder.query(&query_params);
+            let params = crate::apis::parse_deep_object("{{{baseName}}}", &serde_json::to_value(param_value)?);
+            local_var_req_builder = local_var_req_builder.query(&params);
         }
         {{/isMap}}
         {{/isExplode}}
@@ -256,11 +253,8 @@ impl {{classname}} for {{classname}}Client {
             local_var_req_builder = local_var_req_builder.query(&param_value);
             {{/isModel}}
             {{#isMap}}
-            let mut query_params = Vec::with_capacity(param_value.len());
-            for (key, value) in param_value.iter() {
-                query_params.push((key.to_string(), serde_json::to_string(value)?));
-            }
-            local_var_req_builder = local_var_req_builder.query(&query_params);
+            let params = crate::apis::parse_deep_object("{{{baseName}}}", &serde_json::to_value(param_value)?);
+            local_var_req_builder = local_var_req_builder.query(&params);
             {{/isMap}}
             {{/isExplode}}
             {{/isDeepObject}}
diff --git a/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache b/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
index 5224b0c4d9b5..14e99143c12b 100644
--- a/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
+++ b/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
@@ -180,11 +180,8 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
         req_builder = req_builder.query(&param_value);
         {{/isModel}}
         {{#isMap}}
-        let mut query_params = Vec::with_capacity(param_value.len());
-        for (key, value) in param_value.iter() {
-            query_params.push((key.to_string(), serde_json::to_string(value)?));
-        }
-        req_builder = req_builder.query(&query_params);
+        let params = crate::apis::parse_deep_object("{{{baseName}}}", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
         {{/isMap}}
         {{/isExplode}}
     };
@@ -251,11 +248,8 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
         req_builder = req_builder.query(&param_value);
         {{/isModel}}
         {{#isMap}}
-        let mut query_params = Vec::with_capacity(param_value.len());
-        for (key, value) in param_value.iter() {
-            query_params.push((key.to_string(), serde_json::to_string(value)?));
-        }
-        req_builder = req_builder.query(&query_params);
+        let params = crate::apis::parse_deep_object("{{{baseName}}}", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
         {{/isMap}}
         {{/isExplode}}
         {{/isDeepObject}}
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/rust/RustClientCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/rust/RustClientCodegenTest.java
index f4a92edebb6c..78b680c1380e 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/rust/RustClientCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/rust/RustClientCodegenTest.java
@@ -319,6 +319,31 @@ public void testIntegerPropertyEnum() throws IOException {
         TestUtils.assertFileNotContains(outputPath, linearize("#[serde(rename = \"0\")]"));
     }
 
+    @Test
+    public void testExplodedDeepObjectMapQueryParams() throws IOException {
+        // exploded deepObject maps (typed or free-form) go through parse_deep_object like the non-explode branch
+        for (String library : new String[] {"reqwest", "reqwest-trait"}) {
+            Path target = Files.createTempDirectory("test");
+            target.toFile().deleteOnExit();
+            final CodegenConfigurator configurator = new CodegenConfigurator()
+                    .setGeneratorName("rust")
+                    .setLibrary(library)
+                    .setInputSpec("src/test/resources/3_0/rust/deep-object-free-form-query-param.yaml")
+                    .setSkipOverwrite(false)
+                    .setOutputDir(target.toAbsolutePath().toString().replace("\\", "/"));
+            List<File> files = new DefaultGenerator().opts(configurator.toClientOptInput()).generate();
+            files.forEach(File::deleteOnExit);
+            Path outputPath = Path.of(target.toString(), "/src/apis/default_api.rs");
+            TestUtils.assertFileExists(outputPath);
+            // optional typed map, optional free-form object, required-nullable typed map
+            TestUtils.assertFileContains(outputPath, "crate::apis::parse_deep_object(\"filter\"");
+            TestUtils.assertFileContains(outputPath, "crate::apis::parse_deep_object(\"extra\"");
+            TestUtils.assertFileContains(outputPath, "crate::apis::parse_deep_object(\"scope\"");
+            TestUtils.assertFileNotContains(outputPath, "param_value.len()");
+            TestUtils.assertFileNotContains(outputPath, "param_value.iter()");
+        }
+    }
+
     @Test
     public void testArrayWithObjectEnumValues() throws IOException {
         Path target = Files.createTempDirectory("test");
diff --git a/modules/openapi-generator/src/test/resources/3_0/rust/deep-object-free-form-query-param.yaml b/modules/openapi-generator/src/test/resources/3_0/rust/deep-object-free-form-query-param.yaml
new file mode 100644
index 000000000000..0a2c992091a4
--- /dev/null
+++ b/modules/openapi-generator/src/test/resources/3_0/rust/deep-object-free-form-query-param.yaml
@@ -0,0 +1,36 @@
+openapi: 3.0.3
+info:
+  title: deep object params
+  version: 1.0.0
+paths:
+  /items:
+    get:
+      operationId: listItems
+      parameters:
+        - name: filter
+          in: query
+          style: deepObject
+          explode: true
+          schema:
+            type: object
+            additionalProperties:
+              type: string
+        - name: extra
+          in: query
+          style: deepObject
+          explode: true
+          schema:
+            type: object
+        - name: scope
+          in: query
+          required: true
+          style: deepObject
+          explode: true
+          schema:
+            type: object
+            nullable: true
+            additionalProperties:
+              type: string
+      responses:
+        '200':
+          description: ok
diff --git a/modules/openapi-generator/src/test/resources/3_0/rust/petstore.yaml b/modules/openapi-generator/src/test/resources/3_0/rust/petstore.yaml
index 984954994b4a..d7543bdbddb4 100644
--- a/modules/openapi-generator/src/test/resources/3_0/rust/petstore.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/rust/petstore.yaml
@@ -763,6 +763,39 @@ paths:
                 type: array
                 items:
                   $ref: '#/components/schemas/ModelWithInlineEnum'
+
+  '/tests/deep-object-free-form-query-param':
+    get:
+      tags:
+        - testing
+      parameters:
+        - name: filter
+          in: query
+          style: deepObject
+          explode: true
+          schema:
+            type: object
+            additionalProperties:
+              type: string
+        - name: extra
+          in: query
+          style: deepObject
+          explode: true
+          schema:
+            type: object
+        - name: scope
+          in: query
+          required: true
+          style: deepObject
+          explode: true
+          schema:
+            type: object
+            nullable: true
+            additionalProperties:
+              type: string
+      responses:
+        '200':
+          description: ok
 externalDocs:
   description: Find out more about Swagger
   url: 'http://swagger.io'
diff --git a/samples/client/petstore/rust/hyper/petstore/README.md b/samples/client/petstore/rust/hyper/petstore/README.md
index f04632c5832d..ee880dd8c74f 100644
--- a/samples/client/petstore/rust/hyper/petstore/README.md
+++ b/samples/client/petstore/rust/hyper/petstore/README.md
@@ -42,6 +42,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **Get** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **Post** /store/order | Place an order for a pet
 *TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **Get** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+*TestingApi* | [**tests_deep_object_free_form_query_param_get**](docs/TestingApi.md#tests_deep_object_free_form_query_param_get) | **Get** /tests/deep-object-free-form-query-param | 
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **Get** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_inline_enum_boxing_get**](docs/TestingApi.md#tests_inline_enum_boxing_get) | **Get** /tests/inlineEnumBoxing | Get model with inline enums
 *TestingApi* | [**tests_inline_enum_boxing_post**](docs/TestingApi.md#tests_inline_enum_boxing_post) | **Post** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
diff --git a/samples/client/petstore/rust/hyper/petstore/docs/TestingApi.md b/samples/client/petstore/rust/hyper/petstore/docs/TestingApi.md
index 4409e5141e7d..b40a9cbf54b8 100644
--- a/samples/client/petstore/rust/hyper/petstore/docs/TestingApi.md
+++ b/samples/client/petstore/rust/hyper/petstore/docs/TestingApi.md
@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost/v2*
 Method | HTTP request | Description
 ------------- | ------------- | -------------
 [**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **Get** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+[**tests_deep_object_free_form_query_param_get**](TestingApi.md#tests_deep_object_free_form_query_param_get) | **Get** /tests/deep-object-free-form-query-param | 
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **Get** /tests/fileResponse | Returns an image file
 [**tests_inline_enum_boxing_get**](TestingApi.md#tests_inline_enum_boxing_get) | **Get** /tests/inlineEnumBoxing | Get model with inline enums
 [**tests_inline_enum_boxing_post**](TestingApi.md#tests_inline_enum_boxing_post) | **Post** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
@@ -40,6 +41,36 @@ No authorization required
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
 
+## tests_deep_object_free_form_query_param_get
+
+> tests_deep_object_free_form_query_param_get(scope, filter, extra)
+
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**scope** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  | [required] |
+**filter** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  |  |
+**extra** | Option<[**serde_json::Value**](SerdeJson__Value.md)> |  |  |
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_file_response_get
 
 > std::path::PathBuf tests_file_response_get()
diff --git a/samples/client/petstore/rust/hyper/petstore/src/apis/testing_api.rs b/samples/client/petstore/rust/hyper/petstore/src/apis/testing_api.rs
index 18e5de4ddfec..ad3f19a91d6c 100644
--- a/samples/client/petstore/rust/hyper/petstore/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/hyper/petstore/src/apis/testing_api.rs
@@ -38,6 +38,7 @@ impl<C: Connect> TestingApiClient<C>
 
 pub trait TestingApi: Send + Sync {
     fn tests_all_of_with_one_model_get(&self, person: models::Person) -> Pin<Box<dyn Future<Output = Result<String, Error>> + Send>>;
+    fn tests_deep_object_free_form_query_param_get(&self, scope: Option<std::collections::HashMap<String, String>>, filter: Option<std::collections::HashMap<String, String>>, extra: Option<models::serde_json::Value>) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send>>;
     fn tests_file_response_get(&self, ) -> Pin<Box<dyn Future<Output = Result<std::path::PathBuf, Error>> + Send>>;
     fn tests_inline_enum_boxing_get(&self, status: Option<&str>) -> Pin<Box<dyn Future<Output = Result<Vec<models::ModelWithInlineEnum>, Error>> + Send>>;
     fn tests_inline_enum_boxing_post(&self, model_with_inline_enum: models::ModelWithInlineEnum) -> Pin<Box<dyn Future<Output = Result<models::ModelWithInlineEnum, Error>> + Send>>;
@@ -55,6 +56,33 @@ impl<C: Connect>TestingApi for TestingApiClient<C>
         req.execute(self.configuration.borrow())
     }
 
+    #[allow(unused_mut)]
+    fn tests_deep_object_free_form_query_param_get(&self, scope: Option<std::collections::HashMap<String, String>>, filter: Option<std::collections::HashMap<String, String>>, extra: Option<models::serde_json::Value>) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send>> {
+        let mut req = __internal_request::Request::new(hyper::Method::GET, "/tests/deep-object-free-form-query-param".to_string())
+        ;
+        if let Some(ref s) = filter {
+            let query_value = match serde_json::to_string(s) {
+                Ok(value) => value,
+                Err(e) => return Box::pin(futures::future::err(Error::Serde(e))),
+            };
+            req = req.with_query_param("filter".to_string(), query_value);
+        }
+        if let Some(ref s) = extra {
+            let query_value = match serde_json::to_string(s) {
+                Ok(value) => value,
+                Err(e) => return Box::pin(futures::future::err(Error::Serde(e))),
+            };
+            req = req.with_query_param("extra".to_string(), query_value);
+        }
+        match scope {
+            Some(param_value) => { req = req.with_query_param("scope".to_string(), param_value.to_string()); },
+            None => { req = req.with_query_param("scope".to_string(), "".to_string()); },
+        }
+        req = req.returns_nothing();
+
+        req.execute(self.configuration.borrow())
+    }
+
     #[allow(unused_mut)]
     fn tests_file_response_get(&self, ) -> Pin<Box<dyn Future<Output = Result<std::path::PathBuf, Error>> + Send>> {
         let mut req = __internal_request::Request::new(hyper::Method::GET, "/tests/fileResponse".to_string())
diff --git a/samples/client/petstore/rust/hyper0x/petstore/README.md b/samples/client/petstore/rust/hyper0x/petstore/README.md
index d6411d487783..f44ef336fcf5 100644
--- a/samples/client/petstore/rust/hyper0x/petstore/README.md
+++ b/samples/client/petstore/rust/hyper0x/petstore/README.md
@@ -42,6 +42,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
 *TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+*TestingApi* | [**tests_deep_object_free_form_query_param_get**](docs/TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_inline_enum_boxing_get**](docs/TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 *TestingApi* | [**tests_inline_enum_boxing_post**](docs/TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
diff --git a/samples/client/petstore/rust/hyper0x/petstore/docs/TestingApi.md b/samples/client/petstore/rust/hyper0x/petstore/docs/TestingApi.md
index a14a8e0c081d..5c2b5941231b 100644
--- a/samples/client/petstore/rust/hyper0x/petstore/docs/TestingApi.md
+++ b/samples/client/petstore/rust/hyper0x/petstore/docs/TestingApi.md
@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost/v2*
 Method | HTTP request | Description
 ------------- | ------------- | -------------
 [**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+[**tests_deep_object_free_form_query_param_get**](TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_inline_enum_boxing_get**](TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 [**tests_inline_enum_boxing_post**](TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
@@ -40,6 +41,36 @@ No authorization required
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
 
+## tests_deep_object_free_form_query_param_get
+
+> tests_deep_object_free_form_query_param_get(scope, filter, extra)
+
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**scope** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  | [required] |
+**filter** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  |  |
+**extra** | Option<[**serde_json::Value**](SerdeJson__Value.md)> |  |  |
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_file_response_get
 
 > std::path::PathBuf tests_file_response_get()
diff --git a/samples/client/petstore/rust/hyper0x/petstore/src/apis/testing_api.rs b/samples/client/petstore/rust/hyper0x/petstore/src/apis/testing_api.rs
index ff544bb10870..3d5edc48c8e0 100644
--- a/samples/client/petstore/rust/hyper0x/petstore/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/hyper0x/petstore/src/apis/testing_api.rs
@@ -37,6 +37,7 @@ impl<C: hyper::client::connect::Connect> TestingApiClient<C>
 
 pub trait TestingApi {
     fn tests_all_of_with_one_model_get(&self, person: models::Person) -> Pin<Box<dyn Future<Output = Result<String, Error>>>>;
+    fn tests_deep_object_free_form_query_param_get(&self, scope: Option<std::collections::HashMap<String, String>>, filter: Option<std::collections::HashMap<String, String>>, extra: Option<models::serde_json::Value>) -> Pin<Box<dyn Future<Output = Result<(), Error>>>>;
     fn tests_file_response_get(&self, ) -> Pin<Box<dyn Future<Output = Result<std::path::PathBuf, Error>>>>;
     fn tests_inline_enum_boxing_get(&self, status: Option<&str>) -> Pin<Box<dyn Future<Output = Result<Vec<models::ModelWithInlineEnum>, Error>>>>;
     fn tests_inline_enum_boxing_post(&self, model_with_inline_enum: models::ModelWithInlineEnum) -> Pin<Box<dyn Future<Output = Result<models::ModelWithInlineEnum, Error>>>>;
@@ -54,6 +55,33 @@ impl<C: hyper::client::connect::Connect>TestingApi for TestingApiClient<C>
         req.execute(self.configuration.borrow())
     }
 
+    #[allow(unused_mut)]
+    fn tests_deep_object_free_form_query_param_get(&self, scope: Option<std::collections::HashMap<String, String>>, filter: Option<std::collections::HashMap<String, String>>, extra: Option<models::serde_json::Value>) -> Pin<Box<dyn Future<Output = Result<(), Error>>>> {
+        let mut req = __internal_request::Request::new(hyper::Method::GET, "/tests/deep-object-free-form-query-param".to_string())
+        ;
+        if let Some(ref s) = filter {
+            let query_value = match serde_json::to_string(s) {
+                Ok(value) => value,
+                Err(e) => return Box::pin(futures::future::err(Error::Serde(e))),
+            };
+            req = req.with_query_param("filter".to_string(), query_value);
+        }
+        if let Some(ref s) = extra {
+            let query_value = match serde_json::to_string(s) {
+                Ok(value) => value,
+                Err(e) => return Box::pin(futures::future::err(Error::Serde(e))),
+            };
+            req = req.with_query_param("extra".to_string(), query_value);
+        }
+        match scope {
+            Some(param_value) => { req = req.with_query_param("scope".to_string(), param_value.to_string()); },
+            None => { req = req.with_query_param("scope".to_string(), "".to_string()); },
+        }
+        req = req.returns_nothing();
+
+        req.execute(self.configuration.borrow())
+    }
+
     #[allow(unused_mut)]
     fn tests_file_response_get(&self, ) -> Pin<Box<dyn Future<Output = Result<std::path::PathBuf, Error>>>> {
         let mut req = __internal_request::Request::new(hyper::Method::GET, "/tests/fileResponse".to_string())
diff --git a/samples/client/petstore/rust/reqwest-trait/petstore/README.md b/samples/client/petstore/rust/reqwest-trait/petstore/README.md
index 56a28b3e8229..dd1fb1d90b02 100644
--- a/samples/client/petstore/rust/reqwest-trait/petstore/README.md
+++ b/samples/client/petstore/rust/reqwest-trait/petstore/README.md
@@ -42,6 +42,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
 *TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+*TestingApi* | [**tests_deep_object_free_form_query_param_get**](docs/TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_inline_enum_boxing_get**](docs/TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 *TestingApi* | [**tests_inline_enum_boxing_post**](docs/TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
diff --git a/samples/client/petstore/rust/reqwest-trait/petstore/docs/TestingApi.md b/samples/client/petstore/rust/reqwest-trait/petstore/docs/TestingApi.md
index a14a8e0c081d..5c2b5941231b 100644
--- a/samples/client/petstore/rust/reqwest-trait/petstore/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest-trait/petstore/docs/TestingApi.md
@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost/v2*
 Method | HTTP request | Description
 ------------- | ------------- | -------------
 [**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+[**tests_deep_object_free_form_query_param_get**](TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_inline_enum_boxing_get**](TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 [**tests_inline_enum_boxing_post**](TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
@@ -40,6 +41,36 @@ No authorization required
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
 
+## tests_deep_object_free_form_query_param_get
+
+> tests_deep_object_free_form_query_param_get(scope, filter, extra)
+
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**scope** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  | [required] |
+**filter** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  |  |
+**extra** | Option<[**serde_json::Value**](SerdeJson__Value.md)> |  |  |
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_file_response_get
 
 > std::path::PathBuf tests_file_response_get()
diff --git a/samples/client/petstore/rust/reqwest-trait/petstore/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest-trait/petstore/src/apis/testing_api.rs
index 7dc23023226d..78af315d8421 100644
--- a/samples/client/petstore/rust/reqwest-trait/petstore/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest-trait/petstore/src/apis/testing_api.rs
@@ -28,6 +28,11 @@ pub trait TestingApi: Send + Sync {
     /// 
     async fn tests_all_of_with_one_model_get<'person>(&self, person: models::Person) -> Result<String, Error<TestsAllOfWithOneModelGetError>>;
 
+    /// GET /tests/deep-object-free-form-query-param
+    ///
+    /// 
+    async fn tests_deep_object_free_form_query_param_get<'scope, 'filter, 'extra>(&self, scope: Option<std::collections::HashMap<String, String>>, filter: Option<std::collections::HashMap<String, String>>, extra: Option<models::serde_json::Value>) -> Result<(), Error<TestsDeepObjectFreeFormQueryParamGetError>>;
+
     /// GET /tests/fileResponse
     ///
     /// 
@@ -101,6 +106,45 @@ impl TestingApi for TestingApiClient {
         }
     }
 
+    async fn tests_deep_object_free_form_query_param_get<'scope, 'filter, 'extra>(&self, scope: Option<std::collections::HashMap<String, String>>, filter: Option<std::collections::HashMap<String, String>>, extra: Option<models::serde_json::Value>) -> Result<(), Error<TestsDeepObjectFreeFormQueryParamGetError>> {
+        let local_var_configuration = &self.configuration;
+
+        let local_var_client = &local_var_configuration.client;
+
+        let local_var_uri_str = format!("{}/tests/deep-object-free-form-query-param", local_var_configuration.base_path);
+        let mut local_var_req_builder = local_var_client.request(reqwest::Method::GET, local_var_uri_str.as_str());
+
+        if let Some(ref param_value) = filter {
+            let params = crate::apis::parse_deep_object("filter", &serde_json::to_value(param_value)?);
+            local_var_req_builder = local_var_req_builder.query(&params);
+        }
+        if let Some(ref param_value) = extra {
+            let params = crate::apis::parse_deep_object("extra", &serde_json::to_value(param_value)?);
+            local_var_req_builder = local_var_req_builder.query(&params);
+        }
+        if let Some(ref param_value) = scope {
+            let params = crate::apis::parse_deep_object("scope", &serde_json::to_value(param_value)?);
+            local_var_req_builder = local_var_req_builder.query(&params);
+        }
+        if let Some(ref local_var_user_agent) = local_var_configuration.user_agent {
+            local_var_req_builder = local_var_req_builder.header(reqwest::header::USER_AGENT, local_var_user_agent.clone());
+        }
+
+        let local_var_req = local_var_req_builder.build()?;
+        let local_var_resp = local_var_client.execute(local_var_req).await?;
+
+        let local_var_status = local_var_resp.status();
+        let local_var_content = local_var_resp.text().await?;
+
+        if !local_var_status.is_client_error() && !local_var_status.is_server_error() {
+            Ok(())
+        } else {
+            let local_var_entity: Option<TestsDeepObjectFreeFormQueryParamGetError> = serde_json::from_str(&local_var_content).ok();
+            let local_var_error = ResponseContent { status: local_var_status, content: local_var_content, entity: local_var_entity };
+            Err(Error::ResponseError(local_var_error))
+        }
+    }
+
     async fn tests_file_response_get<>(&self, ) -> Result<std::path::PathBuf, Error<TestsFileResponseGetError>> {
         let local_var_configuration = &self.configuration;
 
@@ -264,6 +308,13 @@ pub enum TestsAllOfWithOneModelGetError {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`TestingApi::tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`TestingApi::tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-middleware/README.md b/samples/client/petstore/rust/reqwest/petstore-async-middleware/README.md
index 7ade583f5529..6f3f651843ab 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-middleware/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-async-middleware/README.md
@@ -42,6 +42,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
 *TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+*TestingApi* | [**tests_deep_object_free_form_query_param_get**](docs/TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_inline_enum_boxing_get**](docs/TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 *TestingApi* | [**tests_inline_enum_boxing_post**](docs/TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-middleware/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-async-middleware/docs/TestingApi.md
index a14a8e0c081d..5c2b5941231b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-middleware/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-async-middleware/docs/TestingApi.md
@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost/v2*
 Method | HTTP request | Description
 ------------- | ------------- | -------------
 [**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+[**tests_deep_object_free_form_query_param_get**](TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_inline_enum_boxing_get**](TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 [**tests_inline_enum_boxing_post**](TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
@@ -40,6 +41,36 @@ No authorization required
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
 
+## tests_deep_object_free_form_query_param_get
+
+> tests_deep_object_free_form_query_param_get(scope, filter, extra)
+
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**scope** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  | [required] |
+**filter** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  |  |
+**extra** | Option<[**serde_json::Value**](SerdeJson__Value.md)> |  |  |
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_file_response_get
 
 > std::path::PathBuf tests_file_response_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-middleware/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-async-middleware/src/apis/testing_api.rs
index 20d2c519d4b6..926fb3bebe51 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-middleware/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-async-middleware/src/apis/testing_api.rs
@@ -20,6 +20,14 @@ pub struct TestsAllOfWithOneModelGetParams {
     pub person: models::Person
 }
 
+/// struct for passing parameters to the method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Clone, Debug)]
+pub struct TestsDeepObjectFreeFormQueryParamGetParams {
+    pub scope: Option<std::collections::HashMap<String, String>>,
+    pub filter: Option<std::collections::HashMap<String, String>>,
+    pub extra: Option<models::serde_json::Value>
+}
+
 /// struct for passing parameters to the method [`tests_inline_enum_boxing_get`]
 #[derive(Clone, Debug)]
 pub struct TestsInlineEnumBoxingGetParams {
@@ -42,6 +50,14 @@ pub enum TestsAllOfWithOneModelGetSuccess {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed successes of method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetSuccess {
+    Status200(),
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed successes of method [`tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -81,6 +97,13 @@ pub enum TestsAllOfWithOneModelGetError {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -136,6 +159,46 @@ pub async fn tests_all_of_with_one_model_get(configuration: &configuration::Conf
     }
 }
 
+pub async fn tests_deep_object_free_form_query_param_get(configuration: &configuration::Configuration, params: TestsDeepObjectFreeFormQueryParamGetParams) -> Result<ResponseContent<TestsDeepObjectFreeFormQueryParamGetSuccess>, Error<TestsDeepObjectFreeFormQueryParamGetError>> {
+
+    let uri_str = format!("{}/tests/deep-object-free-form-query-param", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref param_value) = params.filter {
+        let params = crate::apis::parse_deep_object("filter", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = params.extra {
+        let params = crate::apis::parse_deep_object("extra", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = params.scope {
+        let params = crate::apis::parse_deep_object("scope", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    };
+    if let Some(ref param_value) = params.scope {
+        req_builder = req_builder.query(&[("scope", &serde_json::to_string(param_value)?)]);
+    };
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        let entity: Option<TestsDeepObjectFreeFormQueryParamGetSuccess> = serde_json::from_str(&content).ok();
+        Ok(ResponseContent { status, content, entity })
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<TestsDeepObjectFreeFormQueryParamGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub async fn tests_file_response_get(configuration: &configuration::Configuration) -> Result<reqwest::Response, Error<TestsFileResponseGetError>> {
 
     let uri_str = format!("{}/tests/fileResponse", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/README.md b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/README.md
index 3c78d0d2f65f..077406ff75bd 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/README.md
@@ -42,6 +42,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
 *TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+*TestingApi* | [**tests_deep_object_free_form_query_param_get**](docs/TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_inline_enum_boxing_get**](docs/TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 *TestingApi* | [**tests_inline_enum_boxing_post**](docs/TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/docs/TestingApi.md
index a14a8e0c081d..5c2b5941231b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/docs/TestingApi.md
@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost/v2*
 Method | HTTP request | Description
 ------------- | ------------- | -------------
 [**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+[**tests_deep_object_free_form_query_param_get**](TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_inline_enum_boxing_get**](TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 [**tests_inline_enum_boxing_post**](TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
@@ -40,6 +41,36 @@ No authorization required
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
 
+## tests_deep_object_free_form_query_param_get
+
+> tests_deep_object_free_form_query_param_get(scope, filter, extra)
+
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**scope** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  | [required] |
+**filter** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  |  |
+**extra** | Option<[**serde_json::Value**](SerdeJson__Value.md)> |  |  |
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_file_response_get
 
 > std::path::PathBuf tests_file_response_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/src/apis/testing_api.rs
index 20d2c519d4b6..926fb3bebe51 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async-tokensource/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-async-tokensource/src/apis/testing_api.rs
@@ -20,6 +20,14 @@ pub struct TestsAllOfWithOneModelGetParams {
     pub person: models::Person
 }
 
+/// struct for passing parameters to the method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Clone, Debug)]
+pub struct TestsDeepObjectFreeFormQueryParamGetParams {
+    pub scope: Option<std::collections::HashMap<String, String>>,
+    pub filter: Option<std::collections::HashMap<String, String>>,
+    pub extra: Option<models::serde_json::Value>
+}
+
 /// struct for passing parameters to the method [`tests_inline_enum_boxing_get`]
 #[derive(Clone, Debug)]
 pub struct TestsInlineEnumBoxingGetParams {
@@ -42,6 +50,14 @@ pub enum TestsAllOfWithOneModelGetSuccess {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed successes of method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetSuccess {
+    Status200(),
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed successes of method [`tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -81,6 +97,13 @@ pub enum TestsAllOfWithOneModelGetError {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -136,6 +159,46 @@ pub async fn tests_all_of_with_one_model_get(configuration: &configuration::Conf
     }
 }
 
+pub async fn tests_deep_object_free_form_query_param_get(configuration: &configuration::Configuration, params: TestsDeepObjectFreeFormQueryParamGetParams) -> Result<ResponseContent<TestsDeepObjectFreeFormQueryParamGetSuccess>, Error<TestsDeepObjectFreeFormQueryParamGetError>> {
+
+    let uri_str = format!("{}/tests/deep-object-free-form-query-param", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref param_value) = params.filter {
+        let params = crate::apis::parse_deep_object("filter", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = params.extra {
+        let params = crate::apis::parse_deep_object("extra", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = params.scope {
+        let params = crate::apis::parse_deep_object("scope", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    };
+    if let Some(ref param_value) = params.scope {
+        req_builder = req_builder.query(&[("scope", &serde_json::to_string(param_value)?)]);
+    };
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        let entity: Option<TestsDeepObjectFreeFormQueryParamGetSuccess> = serde_json::from_str(&content).ok();
+        Ok(ResponseContent { status, content, entity })
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<TestsDeepObjectFreeFormQueryParamGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub async fn tests_file_response_get(configuration: &configuration::Configuration) -> Result<reqwest::Response, Error<TestsFileResponseGetError>> {
 
     let uri_str = format!("{}/tests/fileResponse", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-async/README.md b/samples/client/petstore/rust/reqwest/petstore-async/README.md
index b25caf0ceeda..4b2c1bc01f8b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-async/README.md
@@ -42,6 +42,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
 *TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+*TestingApi* | [**tests_deep_object_free_form_query_param_get**](docs/TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_inline_enum_boxing_get**](docs/TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 *TestingApi* | [**tests_inline_enum_boxing_post**](docs/TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
diff --git a/samples/client/petstore/rust/reqwest/petstore-async/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-async/docs/TestingApi.md
index a14a8e0c081d..5c2b5941231b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-async/docs/TestingApi.md
@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost/v2*
 Method | HTTP request | Description
 ------------- | ------------- | -------------
 [**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+[**tests_deep_object_free_form_query_param_get**](TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_inline_enum_boxing_get**](TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 [**tests_inline_enum_boxing_post**](TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
@@ -40,6 +41,36 @@ No authorization required
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
 
+## tests_deep_object_free_form_query_param_get
+
+> tests_deep_object_free_form_query_param_get(scope, filter, extra)
+
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**scope** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  | [required] |
+**filter** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  |  |
+**extra** | Option<[**serde_json::Value**](SerdeJson__Value.md)> |  |  |
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_file_response_get
 
 > std::path::PathBuf tests_file_response_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-async/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-async/src/apis/testing_api.rs
index 20d2c519d4b6..926fb3bebe51 100644
--- a/samples/client/petstore/rust/reqwest/petstore-async/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-async/src/apis/testing_api.rs
@@ -20,6 +20,14 @@ pub struct TestsAllOfWithOneModelGetParams {
     pub person: models::Person
 }
 
+/// struct for passing parameters to the method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Clone, Debug)]
+pub struct TestsDeepObjectFreeFormQueryParamGetParams {
+    pub scope: Option<std::collections::HashMap<String, String>>,
+    pub filter: Option<std::collections::HashMap<String, String>>,
+    pub extra: Option<models::serde_json::Value>
+}
+
 /// struct for passing parameters to the method [`tests_inline_enum_boxing_get`]
 #[derive(Clone, Debug)]
 pub struct TestsInlineEnumBoxingGetParams {
@@ -42,6 +50,14 @@ pub enum TestsAllOfWithOneModelGetSuccess {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed successes of method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetSuccess {
+    Status200(),
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed successes of method [`tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -81,6 +97,13 @@ pub enum TestsAllOfWithOneModelGetError {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -136,6 +159,46 @@ pub async fn tests_all_of_with_one_model_get(configuration: &configuration::Conf
     }
 }
 
+pub async fn tests_deep_object_free_form_query_param_get(configuration: &configuration::Configuration, params: TestsDeepObjectFreeFormQueryParamGetParams) -> Result<ResponseContent<TestsDeepObjectFreeFormQueryParamGetSuccess>, Error<TestsDeepObjectFreeFormQueryParamGetError>> {
+
+    let uri_str = format!("{}/tests/deep-object-free-form-query-param", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref param_value) = params.filter {
+        let params = crate::apis::parse_deep_object("filter", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = params.extra {
+        let params = crate::apis::parse_deep_object("extra", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = params.scope {
+        let params = crate::apis::parse_deep_object("scope", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    };
+    if let Some(ref param_value) = params.scope {
+        req_builder = req_builder.query(&[("scope", &serde_json::to_string(param_value)?)]);
+    };
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        let entity: Option<TestsDeepObjectFreeFormQueryParamGetSuccess> = serde_json::from_str(&content).ok();
+        Ok(ResponseContent { status, content, entity })
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<TestsDeepObjectFreeFormQueryParamGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub async fn tests_file_response_get(configuration: &configuration::Configuration) -> Result<reqwest::Response, Error<TestsFileResponseGetError>> {
 
     let uri_str = format!("{}/tests/fileResponse", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-avoid-box/README.md b/samples/client/petstore/rust/reqwest/petstore-avoid-box/README.md
index 76d02f3d514a..1d8cf52b8dca 100644
--- a/samples/client/petstore/rust/reqwest/petstore-avoid-box/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-avoid-box/README.md
@@ -42,6 +42,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
 *TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+*TestingApi* | [**tests_deep_object_free_form_query_param_get**](docs/TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_inline_enum_boxing_get**](docs/TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 *TestingApi* | [**tests_inline_enum_boxing_post**](docs/TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
diff --git a/samples/client/petstore/rust/reqwest/petstore-avoid-box/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-avoid-box/docs/TestingApi.md
index a14a8e0c081d..5c2b5941231b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-avoid-box/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-avoid-box/docs/TestingApi.md
@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost/v2*
 Method | HTTP request | Description
 ------------- | ------------- | -------------
 [**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+[**tests_deep_object_free_form_query_param_get**](TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_inline_enum_boxing_get**](TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 [**tests_inline_enum_boxing_post**](TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
@@ -40,6 +41,36 @@ No authorization required
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
 
+## tests_deep_object_free_form_query_param_get
+
+> tests_deep_object_free_form_query_param_get(scope, filter, extra)
+
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**scope** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  | [required] |
+**filter** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  |  |
+**extra** | Option<[**serde_json::Value**](SerdeJson__Value.md)> |  |  |
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_file_response_get
 
 > std::path::PathBuf tests_file_response_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-avoid-box/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-avoid-box/src/apis/testing_api.rs
index 20d2c519d4b6..926fb3bebe51 100644
--- a/samples/client/petstore/rust/reqwest/petstore-avoid-box/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-avoid-box/src/apis/testing_api.rs
@@ -20,6 +20,14 @@ pub struct TestsAllOfWithOneModelGetParams {
     pub person: models::Person
 }
 
+/// struct for passing parameters to the method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Clone, Debug)]
+pub struct TestsDeepObjectFreeFormQueryParamGetParams {
+    pub scope: Option<std::collections::HashMap<String, String>>,
+    pub filter: Option<std::collections::HashMap<String, String>>,
+    pub extra: Option<models::serde_json::Value>
+}
+
 /// struct for passing parameters to the method [`tests_inline_enum_boxing_get`]
 #[derive(Clone, Debug)]
 pub struct TestsInlineEnumBoxingGetParams {
@@ -42,6 +50,14 @@ pub enum TestsAllOfWithOneModelGetSuccess {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed successes of method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetSuccess {
+    Status200(),
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed successes of method [`tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -81,6 +97,13 @@ pub enum TestsAllOfWithOneModelGetError {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -136,6 +159,46 @@ pub async fn tests_all_of_with_one_model_get(configuration: &configuration::Conf
     }
 }
 
+pub async fn tests_deep_object_free_form_query_param_get(configuration: &configuration::Configuration, params: TestsDeepObjectFreeFormQueryParamGetParams) -> Result<ResponseContent<TestsDeepObjectFreeFormQueryParamGetSuccess>, Error<TestsDeepObjectFreeFormQueryParamGetError>> {
+
+    let uri_str = format!("{}/tests/deep-object-free-form-query-param", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref param_value) = params.filter {
+        let params = crate::apis::parse_deep_object("filter", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = params.extra {
+        let params = crate::apis::parse_deep_object("extra", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = params.scope {
+        let params = crate::apis::parse_deep_object("scope", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    };
+    if let Some(ref param_value) = params.scope {
+        req_builder = req_builder.query(&[("scope", &serde_json::to_string(param_value)?)]);
+    };
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        let entity: Option<TestsDeepObjectFreeFormQueryParamGetSuccess> = serde_json::from_str(&content).ok();
+        Ok(ResponseContent { status, content, entity })
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<TestsDeepObjectFreeFormQueryParamGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub async fn tests_file_response_get(configuration: &configuration::Configuration) -> Result<reqwest::Response, Error<TestsFileResponseGetError>> {
 
     let uri_str = format!("{}/tests/fileResponse", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/README.md b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/README.md
index 6310392f0fac..75773e4c0100 100644
--- a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/README.md
@@ -42,6 +42,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
 *TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+*TestingApi* | [**tests_deep_object_free_form_query_param_get**](docs/TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_inline_enum_boxing_get**](docs/TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 *TestingApi* | [**tests_inline_enum_boxing_post**](docs/TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
diff --git a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/docs/TestingApi.md
index a14a8e0c081d..5c2b5941231b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/docs/TestingApi.md
@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost/v2*
 Method | HTTP request | Description
 ------------- | ------------- | -------------
 [**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+[**tests_deep_object_free_form_query_param_get**](TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_inline_enum_boxing_get**](TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 [**tests_inline_enum_boxing_post**](TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
@@ -40,6 +41,36 @@ No authorization required
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
 
+## tests_deep_object_free_form_query_param_get
+
+> tests_deep_object_free_form_query_param_get(scope, filter, extra)
+
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**scope** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  | [required] |
+**filter** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  |  |
+**extra** | Option<[**serde_json::Value**](SerdeJson__Value.md)> |  |  |
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_file_response_get
 
 > std::path::PathBuf tests_file_response_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/apis/testing_api.rs
index f286b427dac9..213d3ed5612f 100644
--- a/samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/apis/testing_api.rs
@@ -22,6 +22,13 @@ pub enum TestsAllOfWithOneModelGetError {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -88,6 +95,48 @@ pub fn tests_all_of_with_one_model_get(configuration: &configuration::Configurat
     }
 }
 
+pub fn tests_deep_object_free_form_query_param_get(configuration: &configuration::Configuration, scope: Option<std::collections::HashMap<String, String>>, filter: Option<std::collections::HashMap<String, String>>, extra: Option<models::serde_json::Value>) -> Result<(), Error<TestsDeepObjectFreeFormQueryParamGetError>> {
+    // add a prefix to parameters to efficiently prevent name collisions
+    let p_query_scope = scope;
+    let p_query_filter = filter;
+    let p_query_extra = extra;
+
+    let uri_str = format!("{}/tests/deep-object-free-form-query-param", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref param_value) = p_query_filter {
+        let params = crate::apis::parse_deep_object("filter", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = p_query_extra {
+        let params = crate::apis::parse_deep_object("extra", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = p_query_scope {
+        let params = crate::apis::parse_deep_object("scope", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    };
+    if let Some(ref param_value) = p_query_scope {
+        req_builder = req_builder.query(&[("scope", &serde_json::to_string(param_value)?)]);
+    };
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req)?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        Ok(())
+    } else {
+        let content = resp.text()?;
+        let entity: Option<TestsDeepObjectFreeFormQueryParamGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub fn tests_file_response_get(configuration: &configuration::Configuration, ) -> Result<reqwest::blocking::Response, Error<TestsFileResponseGetError>> {
 
     let uri_str = format!("{}/tests/fileResponse", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/README.md b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/README.md
index 44d16d2693a3..e3ddf9c464f9 100644
--- a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/README.md
@@ -42,6 +42,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
 *TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+*TestingApi* | [**tests_deep_object_free_form_query_param_get**](docs/TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_inline_enum_boxing_get**](docs/TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 *TestingApi* | [**tests_inline_enum_boxing_post**](docs/TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
diff --git a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/docs/TestingApi.md
index 55e67cfc4aff..d2a3b9ec12ee 100644
--- a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/docs/TestingApi.md
@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost/v2*
 Method | HTTP request | Description
 ------------- | ------------- | -------------
 [**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+[**tests_deep_object_free_form_query_param_get**](TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_inline_enum_boxing_get**](TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 [**tests_inline_enum_boxing_post**](TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
@@ -40,6 +41,36 @@ No authorization required
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
 
+## tests_deep_object_free_form_query_param_get
+
+> tests_deep_object_free_form_query_param_get(scope, filter, extra)
+
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**scope** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  | [required] |
+**filter** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  |  |
+**extra** | Option<[**serde_json::Value**](SerdeJson__Value.md)> |  |  |
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_file_response_get
 
 > std::path::PathBuf tests_file_response_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/src/apis/testing_api.rs
index 6cc8c976ba35..c81829959116 100644
--- a/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-model-name-prefix/src/apis/testing_api.rs
@@ -22,6 +22,13 @@ pub enum TestsAllOfWithOneModelGetError {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -88,6 +95,48 @@ pub fn tests_all_of_with_one_model_get(configuration: &configuration::Configurat
     }
 }
 
+pub fn tests_deep_object_free_form_query_param_get(configuration: &configuration::Configuration, scope: Option<std::collections::HashMap<String, String>>, filter: Option<std::collections::HashMap<String, String>>, extra: Option<models::serde_json::Value>) -> Result<(), Error<TestsDeepObjectFreeFormQueryParamGetError>> {
+    // add a prefix to parameters to efficiently prevent name collisions
+    let p_query_scope = scope;
+    let p_query_filter = filter;
+    let p_query_extra = extra;
+
+    let uri_str = format!("{}/tests/deep-object-free-form-query-param", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref param_value) = p_query_filter {
+        let params = crate::apis::parse_deep_object("filter", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = p_query_extra {
+        let params = crate::apis::parse_deep_object("extra", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = p_query_scope {
+        let params = crate::apis::parse_deep_object("scope", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    };
+    if let Some(ref param_value) = p_query_scope {
+        req_builder = req_builder.query(&[("scope", &serde_json::to_string(param_value)?)]);
+    };
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req)?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        Ok(())
+    } else {
+        let content = resp.text()?;
+        let entity: Option<TestsDeepObjectFreeFormQueryParamGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub fn tests_file_response_get(configuration: &configuration::Configuration, ) -> Result<reqwest::blocking::Response, Error<TestsFileResponseGetError>> {
 
     let uri_str = format!("{}/tests/fileResponse", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-no-chrono/README.md b/samples/client/petstore/rust/reqwest/petstore-no-chrono/README.md
index 790ede098a97..db949b4a32e2 100644
--- a/samples/client/petstore/rust/reqwest/petstore-no-chrono/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-no-chrono/README.md
@@ -42,6 +42,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
 *TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+*TestingApi* | [**tests_deep_object_free_form_query_param_get**](docs/TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_inline_enum_boxing_get**](docs/TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 *TestingApi* | [**tests_inline_enum_boxing_post**](docs/TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
diff --git a/samples/client/petstore/rust/reqwest/petstore-no-chrono/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-no-chrono/docs/TestingApi.md
index a14a8e0c081d..5c2b5941231b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-no-chrono/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-no-chrono/docs/TestingApi.md
@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost/v2*
 Method | HTTP request | Description
 ------------- | ------------- | -------------
 [**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+[**tests_deep_object_free_form_query_param_get**](TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_inline_enum_boxing_get**](TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 [**tests_inline_enum_boxing_post**](TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
@@ -40,6 +41,36 @@ No authorization required
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
 
+## tests_deep_object_free_form_query_param_get
+
+> tests_deep_object_free_form_query_param_get(scope, filter, extra)
+
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**scope** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  | [required] |
+**filter** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  |  |
+**extra** | Option<[**serde_json::Value**](SerdeJson__Value.md)> |  |  |
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_file_response_get
 
 > std::path::PathBuf tests_file_response_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-no-chrono/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-no-chrono/src/apis/testing_api.rs
index f286b427dac9..213d3ed5612f 100644
--- a/samples/client/petstore/rust/reqwest/petstore-no-chrono/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-no-chrono/src/apis/testing_api.rs
@@ -22,6 +22,13 @@ pub enum TestsAllOfWithOneModelGetError {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -88,6 +95,48 @@ pub fn tests_all_of_with_one_model_get(configuration: &configuration::Configurat
     }
 }
 
+pub fn tests_deep_object_free_form_query_param_get(configuration: &configuration::Configuration, scope: Option<std::collections::HashMap<String, String>>, filter: Option<std::collections::HashMap<String, String>>, extra: Option<models::serde_json::Value>) -> Result<(), Error<TestsDeepObjectFreeFormQueryParamGetError>> {
+    // add a prefix to parameters to efficiently prevent name collisions
+    let p_query_scope = scope;
+    let p_query_filter = filter;
+    let p_query_extra = extra;
+
+    let uri_str = format!("{}/tests/deep-object-free-form-query-param", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref param_value) = p_query_filter {
+        let params = crate::apis::parse_deep_object("filter", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = p_query_extra {
+        let params = crate::apis::parse_deep_object("extra", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = p_query_scope {
+        let params = crate::apis::parse_deep_object("scope", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    };
+    if let Some(ref param_value) = p_query_scope {
+        req_builder = req_builder.query(&[("scope", &serde_json::to_string(param_value)?)]);
+    };
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req)?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        Ok(())
+    } else {
+        let content = resp.text()?;
+        let entity: Option<TestsDeepObjectFreeFormQueryParamGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub fn tests_file_response_get(configuration: &configuration::Configuration, ) -> Result<reqwest::blocking::Response, Error<TestsFileResponseGetError>> {
 
     let uri_str = format!("{}/tests/fileResponse", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore-serde-path-to-error/README.md b/samples/client/petstore/rust/reqwest/petstore-serde-path-to-error/README.md
index 49732402af49..b39c05645462 100644
--- a/samples/client/petstore/rust/reqwest/petstore-serde-path-to-error/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore-serde-path-to-error/README.md
@@ -42,6 +42,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
 *TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+*TestingApi* | [**tests_deep_object_free_form_query_param_get**](docs/TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_inline_enum_boxing_get**](docs/TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 *TestingApi* | [**tests_inline_enum_boxing_post**](docs/TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
diff --git a/samples/client/petstore/rust/reqwest/petstore-serde-path-to-error/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore-serde-path-to-error/docs/TestingApi.md
index a14a8e0c081d..5c2b5941231b 100644
--- a/samples/client/petstore/rust/reqwest/petstore-serde-path-to-error/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore-serde-path-to-error/docs/TestingApi.md
@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost/v2*
 Method | HTTP request | Description
 ------------- | ------------- | -------------
 [**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+[**tests_deep_object_free_form_query_param_get**](TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_inline_enum_boxing_get**](TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 [**tests_inline_enum_boxing_post**](TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
@@ -40,6 +41,36 @@ No authorization required
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
 
+## tests_deep_object_free_form_query_param_get
+
+> tests_deep_object_free_form_query_param_get(scope, filter, extra)
+
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**scope** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  | [required] |
+**filter** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  |  |
+**extra** | Option<[**serde_json::Value**](SerdeJson__Value.md)> |  |  |
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_file_response_get
 
 > std::path::PathBuf tests_file_response_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore-serde-path-to-error/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore-serde-path-to-error/src/apis/testing_api.rs
index e8afa6500d14..0949355bca63 100644
--- a/samples/client/petstore/rust/reqwest/petstore-serde-path-to-error/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore-serde-path-to-error/src/apis/testing_api.rs
@@ -22,6 +22,13 @@ pub enum TestsAllOfWithOneModelGetError {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -88,6 +95,48 @@ pub async fn tests_all_of_with_one_model_get(configuration: &configuration::Conf
     }
 }
 
+pub async fn tests_deep_object_free_form_query_param_get(configuration: &configuration::Configuration, scope: Option<std::collections::HashMap<String, String>>, filter: Option<std::collections::HashMap<String, String>>, extra: Option<models::serde_json::Value>) -> Result<(), Error<TestsDeepObjectFreeFormQueryParamGetError>> {
+    // add a prefix to parameters to efficiently prevent name collisions
+    let p_query_scope = scope;
+    let p_query_filter = filter;
+    let p_query_extra = extra;
+
+    let uri_str = format!("{}/tests/deep-object-free-form-query-param", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref param_value) = p_query_filter {
+        let params = crate::apis::parse_deep_object("filter", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = p_query_extra {
+        let params = crate::apis::parse_deep_object("extra", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = p_query_scope {
+        let params = crate::apis::parse_deep_object("scope", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    };
+    if let Some(ref param_value) = p_query_scope {
+        req_builder = req_builder.query(&[("scope", &serde_json::to_string(param_value)?)]);
+    };
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        Ok(())
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<TestsDeepObjectFreeFormQueryParamGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub async fn tests_file_response_get(configuration: &configuration::Configuration, ) -> Result<reqwest::Response, Error<TestsFileResponseGetError>> {
 
     let uri_str = format!("{}/tests/fileResponse", configuration.base_path);
diff --git a/samples/client/petstore/rust/reqwest/petstore/README.md b/samples/client/petstore/rust/reqwest/petstore/README.md
index 296bdd4bd9d0..d8024875abfb 100644
--- a/samples/client/petstore/rust/reqwest/petstore/README.md
+++ b/samples/client/petstore/rust/reqwest/petstore/README.md
@@ -42,6 +42,7 @@ Class | Method | HTTP request | Description
 *StoreApi* | [**get_order_by_id**](docs/StoreApi.md#get_order_by_id) | **GET** /store/order/{orderId} | Find purchase order by ID
 *StoreApi* | [**place_order**](docs/StoreApi.md#place_order) | **POST** /store/order | Place an order for a pet
 *TestingApi* | [**tests_all_of_with_one_model_get**](docs/TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+*TestingApi* | [**tests_deep_object_free_form_query_param_get**](docs/TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 *TestingApi* | [**tests_file_response_get**](docs/TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 *TestingApi* | [**tests_inline_enum_boxing_get**](docs/TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 *TestingApi* | [**tests_inline_enum_boxing_post**](docs/TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
diff --git a/samples/client/petstore/rust/reqwest/petstore/docs/TestingApi.md b/samples/client/petstore/rust/reqwest/petstore/docs/TestingApi.md
index a14a8e0c081d..5c2b5941231b 100644
--- a/samples/client/petstore/rust/reqwest/petstore/docs/TestingApi.md
+++ b/samples/client/petstore/rust/reqwest/petstore/docs/TestingApi.md
@@ -5,6 +5,7 @@ All URIs are relative to *http://localhost/v2*
 Method | HTTP request | Description
 ------------- | ------------- | -------------
 [**tests_all_of_with_one_model_get**](TestingApi.md#tests_all_of_with_one_model_get) | **GET** /tests/allOfWithOneModel | Test for allOf with a single option. (One of the issues in #20500)
+[**tests_deep_object_free_form_query_param_get**](TestingApi.md#tests_deep_object_free_form_query_param_get) | **GET** /tests/deep-object-free-form-query-param | 
 [**tests_file_response_get**](TestingApi.md#tests_file_response_get) | **GET** /tests/fileResponse | Returns an image file
 [**tests_inline_enum_boxing_get**](TestingApi.md#tests_inline_enum_boxing_get) | **GET** /tests/inlineEnumBoxing | Get model with inline enums
 [**tests_inline_enum_boxing_post**](TestingApi.md#tests_inline_enum_boxing_post) | **POST** /tests/inlineEnumBoxing | Test for inline enum fields not being boxed in model constructors
@@ -40,6 +41,36 @@ No authorization required
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
 
+## tests_deep_object_free_form_query_param_get
+
+> tests_deep_object_free_form_query_param_get(scope, filter, extra)
+
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**scope** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  | [required] |
+**filter** | Option<[**std::collections::HashMap<String, String>**](String.md)> |  |  |
+**extra** | Option<[**serde_json::Value**](SerdeJson__Value.md)> |  |  |
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
 ## tests_file_response_get
 
 > std::path::PathBuf tests_file_response_get()
diff --git a/samples/client/petstore/rust/reqwest/petstore/src/apis/testing_api.rs b/samples/client/petstore/rust/reqwest/petstore/src/apis/testing_api.rs
index f286b427dac9..213d3ed5612f 100644
--- a/samples/client/petstore/rust/reqwest/petstore/src/apis/testing_api.rs
+++ b/samples/client/petstore/rust/reqwest/petstore/src/apis/testing_api.rs
@@ -22,6 +22,13 @@ pub enum TestsAllOfWithOneModelGetError {
     UnknownValue(serde_json::Value),
 }
 
+/// struct for typed errors of method [`tests_deep_object_free_form_query_param_get`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum TestsDeepObjectFreeFormQueryParamGetError {
+    UnknownValue(serde_json::Value),
+}
+
 /// struct for typed errors of method [`tests_file_response_get`]
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -88,6 +95,48 @@ pub fn tests_all_of_with_one_model_get(configuration: &configuration::Configurat
     }
 }
 
+pub fn tests_deep_object_free_form_query_param_get(configuration: &configuration::Configuration, scope: Option<std::collections::HashMap<String, String>>, filter: Option<std::collections::HashMap<String, String>>, extra: Option<models::serde_json::Value>) -> Result<(), Error<TestsDeepObjectFreeFormQueryParamGetError>> {
+    // add a prefix to parameters to efficiently prevent name collisions
+    let p_query_scope = scope;
+    let p_query_filter = filter;
+    let p_query_extra = extra;
+
+    let uri_str = format!("{}/tests/deep-object-free-form-query-param", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref param_value) = p_query_filter {
+        let params = crate::apis::parse_deep_object("filter", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = p_query_extra {
+        let params = crate::apis::parse_deep_object("extra", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    }
+    if let Some(ref param_value) = p_query_scope {
+        let params = crate::apis::parse_deep_object("scope", &serde_json::to_value(param_value)?);
+        req_builder = req_builder.query(&params);
+    };
+    if let Some(ref param_value) = p_query_scope {
+        req_builder = req_builder.query(&[("scope", &serde_json::to_string(param_value)?)]);
+    };
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req)?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        Ok(())
+    } else {
+        let content = resp.text()?;
+        let entity: Option<TestsDeepObjectFreeFormQueryParamGetError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
 pub fn tests_file_response_get(configuration: &configuration::Configuration, ) -> Result<reqwest::blocking::Response, Error<TestsFileResponseGetError>> {
 
     let uri_str = format!("{}/tests/fileResponse", configuration.base_path);