headerSorterPool.Put(sorter)
					return err
				}
			}
			if trace != nil && trace.WroteHeaderField != nil {
				formattedVals = append(formattedVals, v)
			}
		}
		if trace != nil && trace.WroteHeaderField != nil {
			trace.WroteHeaderField(kv.key, formattedVals)
			formattedVals = nil
		}
	}
	headerSorterPool.Put(sorter)
	return nil
}

			return err
		}
		if trace != nil && trace.WroteHeaderField != nil {
			trace.WroteHeaderField("Content-Length", []string{strconv.FormatInt(t.ContentLength, 10)})
		}
	} else if chunked(t.TransferEncoding) {
		if _, err := io.WriteString(w, "Transfer-Encoding: chunked\r\n"); err != nil {
			return err
		}
		if trace != nil && trace.WroteHeaderField != nil {
			trace.WroteHeaderField("Transfer-Encoding", []string{"chunked"})
		}

	// failure.
	TLSHandshakeDone func(tls.ConnectionState, error)

	// WroteHeaderField is called after the Transport has written
	// each request header. At the time of this call the values
	// might be buffered and not yet written to the network.
	WroteHeaderField func(key string, value []string)

	// WroteHeaders is called after the Transport has written
	// all request headers.

	if err != nil {
		return err
	}

	// Header lines
	_, err = fmt.Fprintf(w, "Host: %s\r\n", host)
	if err != nil {
		return err
	}
	if trace != nil && trace.WroteHeaderField != nil {
		trace.WroteHeaderField("Host", []string{host})
	}

	// Use the defaultUserAgent unless the Header contains one, which
	// may be blank to not send the header.
	userAgent := defaultUserAgent

	} else {
		wantOnce("PutIdleConn = <nil>")
		wantOnce("WroteHeaderField: User-Agent: [Go-http-client/1.1]")
		// TODO(meirf): issue 19761. Make these agnostic to h1/h2. (These are not h1 specific, but the
		// WroteHeaderField hook is not yet implemented in h2.)
		wantOnce(fmt.Sprintf("WroteHeaderField: Host: [dns-is-faked.golang:%s]", port))
		wantOnce(fmt.Sprintf("WroteHeaderField: Content-Length: [%d]", len(body)))

pkg net/http, type Transport struct, MaxConnsPerHost int
pkg net/http/httptrace, type ClientTrace struct, Got1xxResponse func(int, textproto.MIMEHeader) error
pkg net/http/httptrace, type ClientTrace struct, WroteHeaderField func(string, []string)
pkg net/http/httputil, type ReverseProxy struct, ErrorHandler func(http.ResponseWriter, *http.Request, error)
pkg os, const ModeIrregular = 524288
pkg os, const ModeIrregular FileMode

	}
}

func http2traceHasWroteHeaderField(trace *httptrace.ClientTrace) bool {
	return trace != nil && trace.WroteHeaderField != nil
}

func http2traceWroteHeaderField(trace *httptrace.ClientTrace, k, v string) {
	if trace != nil && trace.WroteHeaderField != nil {
		trace.WroteHeaderField(k, []string{v})
	}
}

		{"ClientTrace.PutIdleConn", Field, 7},
		{"ClientTrace.TLSHandshakeDone", Field, 8},
		{"ClientTrace.TLSHandshakeStart", Field, 8},
		{"ClientTrace.Wait100Continue", Field, 7},
		{"ClientTrace.WroteHeaderField", Field, 11},
		{"ClientTrace.WroteHeaders", Field, 7},
		{"ClientTrace.WroteRequest", Field, 7},
		{"ContextClientTrace", Func, 7},
		{"DNSDoneInfo", Type, 7},
		{"DNSDoneInfo.Addrs", Field, 7},