net/http: add Transport.MaxIdleConns limit
The HTTP client had a limit for the maximum number of idle connections per-host, but not a global limit. This CLs adds a global idle connection limit too, Transport.MaxIdleConns. All idle conns are now also stored in a doubly-linked list. When there are too many, the oldest one is closed. Fixes #15461 Change-Id: I72abbc28d140c73cf50f278fa70088b45ae0deef Reviewed-on: https://go-review.googlesource.com/22655Reviewed-by:Andrew Gerrand <adg@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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