Default MaxIdleConnections to 2 when unset - #271
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The Go zero value left the idle pool empty, so every Get dialed a new connection. Unset now uses a small idle size so connections can be reused.
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Summary
Fixes #261.
When
MaxIdleConnectionswas left at the Go zero value, the idle pool never retained connections, so everyGetdialed a new one. Unset now applies a default idle size of 2 so connections can be reused. An explicit positive value still controls the limit as before.Test plan
go test ./net2/TestDefaultMaxIdleConnectionscovering Get, Release, and reuse