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net/http: do not cancel request context on response body read

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When sending a Request with a non-context deadline, we create a
context with a timeout. This context is canceled when closing the
response body, and also if a read from the response body returns
an error (including io.EOF).

Cancelling the context in Response.Body.Read interferes with the
HTTP/2 client cleaning up after a request is completed, and is
unnecessary: The user should always close the body, the impact
from not canceling the context is minor (the context timer leaks
until it fires).

Fixes #49366.

Change-Id: Ieaed866116916261d9079f71d8fea7a7b303b8fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/361919
Trust: Damien Neil <dneil@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Damien Neil 2021-11-08 11:23:27 -08:00
parent 95196512b6
commit 76fbd61673
2 changed files with 27 additions and 1 deletions
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1
src/net/http/client.go
View File

@ -965,7 +965,6 @@ func (b *cancelTimerBody) Read(p []byte) (n int, err error) {
if err == nil {
return n, nil
}
b.stop()
if err == io.EOF {
return n, err
}

27
src/net/http/client_test.go
View File

@ -1368,6 +1368,33 @@ func TestClientTimeoutCancel(t *testing.T) {
}
}
func TestClientTimeoutDoesNotExpire_h1(t *testing.T) { testClientTimeoutDoesNotExpire(t, h1Mode) }
func TestClientTimeoutDoesNotExpire_h2(t *testing.T) { testClientTimeoutDoesNotExpire(t, h2Mode) }
// Issue 49366: if Client.Timeout is set but not hit, no error should be returned.
func testClientTimeoutDoesNotExpire(t *testing.T, h2 bool) {
setParallel(t)
defer afterTest(t)
cst := newClientServerTest(t, h2, HandlerFunc(func(w ResponseWriter, r *Request) {
w.Write([]byte("body"))
}))
defer cst.close()
cst.c.Timeout = 1 * time.Hour
req, _ := NewRequest("GET", cst.ts.URL, nil)
res, err := cst.c.Do(req)
if err != nil {
t.Fatal(err)
}
if _, err = io.Copy(io.Discard, res.Body); err != nil {
t.Fatalf("io.Copy(io.Discard, res.Body) = %v, want nil", err)
}
if err = res.Body.Close(); err != nil {
t.Fatalf("res.Body.Close() = %v, want nil", err)
}
}
func TestClientRedirectEatsBody_h1(t *testing.T) { testClientRedirectEatsBody(t, h1Mode) }
func TestClientRedirectEatsBody_h2(t *testing.T) { testClientRedirectEatsBody(t, h2Mode) }
func testClientRedirectEatsBody(t *testing.T, h2 bool) {