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http: clarify use of w.conn.body in Write when sniffing.
R=gri, r, r, rsc CC=golang-dev https://golang.org/cl/4794047
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@ -359,8 +359,7 @@ func (w *response) sniff() {
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w.needSniff = false
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data := w.conn.body
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fmt.Fprintf(w.conn.buf, "Content-Type: %s\r\n", DetectContentType(data))
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io.WriteString(w.conn.buf, "\r\n")
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fmt.Fprintf(w.conn.buf, "Content-Type: %s\r\n\r\n", DetectContentType(data))
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if len(data) == 0 {
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return
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@ -408,10 +407,14 @@ func (w *response) Write(data []byte) (n int, err os.Error) {
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// We need to sniff the beginning of the output to
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// determine the content type. Accumulate the
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// initial writes in w.conn.body.
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body := w.conn.body
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m = copy(body[len(body):cap(body)], data)
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w.conn.body = body[:len(body)+m]
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if m == len(data) {
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// Cap m so that append won't allocate.
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m := cap(w.conn.body) - len(w.conn.body)
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if m > len(data) {
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m = len(data)
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}
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w.conn.body = append(w.conn.body, data[:m]...)
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data = data[m:]
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if len(data) == 0 {
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// Copied everything into the buffer.
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// Wait for next write.
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return m, nil
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@ -423,7 +426,6 @@ func (w *response) Write(data []byte) (n int, err os.Error) {
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// of the data as a normal Write.
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// Calling sniff clears needSniff.
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w.sniff()
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data = data[m:]
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}
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// TODO(rsc): if chunking happened after the buffering,
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