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http: fix hanging bug with HEAD responses

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The transport readLoop was waiting forever for the client to
read the non-existent body before proceeding to read the next
request.

R=rsc
CC=golang-dev
https://golang.org/cl/4357051
This commit is contained in:
Brad Fitzpatrick 2011-04-04 16:58:11 -07:00
parent 2be13a80c7
commit 7c9c4fc3a1
2 changed files with 31 additions and 2 deletions
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5
src/pkg/http/transport.go
View File

@ -436,11 +436,12 @@ func (pc *persistConn) readLoop() {
} else if err != nil {
alive = false
}
hasBody := resp != nil && resp.ContentLength != 0
rc.ch <- responseAndError{resp, err}
// Wait for the just-returned response body to be fully consumed
// before we race and peek on the underlying bufio reader.
if alive {
if alive && hasBody {
<-resp.Body.(*bodyEOFSignal).ch
}
}
@ -512,7 +513,7 @@ func responseIsKeepAlive(res *Response) bool {
// the response body with a bodyEOFSignal-wrapped version.
func readResponseWithEOFSignal(r *bufio.Reader, requestMethod string) (resp *Response, err os.Error) {
resp, err = ReadResponse(r, requestMethod)
if err == nil {
if err == nil && resp.ContentLength != 0 {
resp.Body = &bodyEOFSignal{resp.Body, make(chan bool, 1), false}
}
return

28
src/pkg/http/transport_test.go
View File

@ -261,6 +261,34 @@ func TestTransportServerClosingUnexpectedly(t *testing.T) {
}
}
// TestTransportHeadResponses verifies that we deal with Content-Lengths
// with no bodies properly
func TestTransportHeadResponses(t *testing.T) {
ts := httptest.NewServer(HandlerFunc(func(w ResponseWriter, r *Request) {
if r.Method != "HEAD" {
panic("expected HEAD; got " + r.Method)
}
w.Header().Set("Content-Length", "123")
w.WriteHeader(200)
}))
defer ts.Close()
tr := &Transport{DisableKeepAlives: false}
c := &Client{Transport: tr}
for i := 0; i < 2; i++ {
res, err := c.Head(ts.URL)
if err != nil {
t.Errorf("error on loop %d: %v", i, err)
}
if e, g := "123", res.Header.Get("Content-Length"); e != g {
t.Errorf("loop %d: expected Content-Length header of %q, got %q", e, g)
}
if e, g := int64(0), res.ContentLength; e != g {
t.Errorf("loop %d: expected res.ContentLength of %v, got %v", e, g)
}
}
}
func TestTransportNilURL(t *testing.T) {
ts := httptest.NewServer(HandlerFunc(func(w ResponseWriter, r *Request) {
fmt.Fprintf(w, "Hi")