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fix: validate paths after stripping publicPath - #77
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Summary
The existing containment check blocks files outside the output directory, but a request such as
/static../dist/index.htmlcan leave and re-enter that directory after strippingpublicPath: "/static". Validate the stripped remainder before joining it to the output path so these requests return 403, while retaining the final containment check and the fast path for ordinary requests.Add one regression case using the existing traversal fixture across all six frameworks; it returns 200 before this change and 403 afterward.
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