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net/http: remove http2 connections when no longer cached
When the http2 transport returns a NoCachedConnError, the connection must be removed from the idle list as well as the connections per host. Fixes #34387 Change-Id: I7875c9c95e694a37a339bb04385243b49f9b20d3 Reviewed-on: https://go-review.googlesource.com/c/go/+/196665 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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@ -539,6 +539,7 @@ func (t *Transport) roundTrip(req *Request) (*Response, error) {
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}
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if http2isNoCachedConnError(err) {
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t.removeIdleConn(pconn)
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t.decConnsPerHost(pconn.cacheKey)
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} else if !pconn.shouldRetryRequest(req, err) {
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// Issue 16465: return underlying net.Conn.Read error from peek,
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// as we've historically done.
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@ -3594,6 +3594,44 @@ func TestTransportTraceGotConnH2IdleConns(t *testing.T) {
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wantIdle("after round trip", 1)
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}
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func TestTransportRemovesH2ConnsAfterIdle(t *testing.T) {
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if testing.Short() {
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t.Skip("skipping in short mode")
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}
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trFunc := func(tr *Transport) {
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tr.MaxConnsPerHost = 1
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tr.MaxIdleConnsPerHost = 1
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tr.IdleConnTimeout = 10 * time.Millisecond
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}
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cst := newClientServerTest(t, h2Mode, HandlerFunc(func(w ResponseWriter, r *Request) {}), trFunc)
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defer cst.close()
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if _, err := cst.c.Get(cst.ts.URL); err != nil {
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t.Fatalf("got error: %s", err)
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}
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time.Sleep(100 * time.Millisecond)
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got := make(chan error)
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go func() {
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if _, err := cst.c.Get(cst.ts.URL); err != nil {
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got <- err
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}
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close(got)
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}()
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timeout := time.NewTimer(5 * time.Second)
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defer timeout.Stop()
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select {
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case err := <-got:
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if err != nil {
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t.Fatalf("got error: %s", err)
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}
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case <-timeout.C:
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t.Fatal("request never completed")
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}
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}
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// This tests that an client requesting a content range won't also
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// implicitly ask for gzip support. If they want that, they need to do it
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// on their own.
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