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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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"launchpad.net/ubuntu-push/http13client"
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// One of the copies, say from b to r2, could be avoided by using a more
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// elaborate trick where the other copy is made during Request/Response.Write.
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// This would complicate things too much, given that these functions are for
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func drainBody(b io.ReadCloser) (r1, r2 io.ReadCloser, err error) {
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if _, err = buf.ReadFrom(b); err != nil {
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if err = b.Close(); err != nil {
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return ioutil.NopCloser(&buf), ioutil.NopCloser(bytes.NewReader(buf.Bytes())), nil
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// dumpConn is a net.Conn which writes to Writer and reads from Reader
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type dumpConn struct {
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func (c *dumpConn) Close() error { return nil }
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func (c *dumpConn) LocalAddr() net.Addr { return nil }
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func (c *dumpConn) RemoteAddr() net.Addr { return nil }
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func (c *dumpConn) SetDeadline(t time.Time) error { return nil }
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func (c *dumpConn) SetReadDeadline(t time.Time) error { return nil }
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func (c *dumpConn) SetWriteDeadline(t time.Time) error { return nil }
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func (b neverEnding) Read(p []byte) (n int, err error) {
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// DumpRequestOut is like DumpRequest but includes
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// headers that the standard http.Transport adds,
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// such as User-Agent.
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func DumpRequestOut(req *http.Request, body bool) ([]byte, error) {
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if !body || req.Body == nil {
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if req.ContentLength != 0 {
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req.Body = ioutil.NopCloser(io.LimitReader(neverEnding('x'), req.ContentLength))
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save, req.Body, err = drainBody(req.Body)
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// Since we're using the actual Transport code to write the request,
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// switch to http so the Transport doesn't try to do an SSL
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// negotiation with our dumpConn and its bytes.Buffer & pipe.
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// The wire format for https and http are the same, anyway.
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if req.URL.Scheme == "https" {
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reqSend = new(http.Request)
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reqSend.URL = new(url.URL)
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*reqSend.URL = *req.URL
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reqSend.URL.Scheme = "http"
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// Use the actual Transport code to record what we would send
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// on the wire, but not using TCP. Use a Transport with a
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// custom dialer that returns a fake net.Conn that waits
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// for the full input (and recording it), and then responds
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// with a dummy response.
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var buf bytes.Buffer // records the output
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dr := &delegateReader{c: make(chan io.Reader)}
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// Wait for the request before replying with a dummy response:
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http.ReadRequest(bufio.NewReader(pr))
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dr.c <- strings.NewReader("HTTP/1.1 204 No Content\r\n\r\n")
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t := &http.Transport{
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Dial: func(net, addr string) (net.Conn, error) {
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return &dumpConn{io.MultiWriter(&buf, pw), dr}, nil
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_, err := t.RoundTrip(reqSend)
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// If we used a dummy body above, remove it now.
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// TODO: if the req.ContentLength is large, we allocate memory
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// unnecessarily just to slice it off here. But this is just
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// a debug function, so this is acceptable for now. We could
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// discard the body earlier if this matters.
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if i := bytes.Index(dump, []byte("\r\n\r\n")); i >= 0 {
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// delegateReader is a reader that delegates to another reader,
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// once it arrives on a channel.
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type delegateReader struct {
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r io.Reader // nil until received from c
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func (r *delegateReader) Read(p []byte) (int, error) {
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// Return value if nonempty, def otherwise.
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func valueOrDefault(value, def string) string {
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var reqWriteExcludeHeaderDump = map[string]bool{
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"Host": true, // not in Header map anyway
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"Content-Length": true,
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"Transfer-Encoding": true,
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// dumpAsReceived writes req to w in the form as it was received, or
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// at least as accurately as possible from the information retained in
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func dumpAsReceived(req *http.Request, w io.Writer) error {
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// DumpRequest returns the as-received wire representation of req,
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// optionally including the request body, for debugging.
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// DumpRequest is semantically a no-op, but in order to
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// dump the body, it reads the body data into memory and
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// changes req.Body to refer to the in-memory copy.
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// The documentation for http.Request.Write details which fields
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func DumpRequest(req *http.Request, body bool) (dump []byte, err error) {
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if !body || req.Body == nil {
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save, req.Body, err = drainBody(req.Body)
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fmt.Fprintf(&b, "%s %s HTTP/%d.%d\r\n", valueOrDefault(req.Method, "GET"),
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req.URL.RequestURI(), req.ProtoMajor, req.ProtoMinor)
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if host == "" && req.URL != nil {
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fmt.Fprintf(&b, "Host: %s\r\n", host)
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chunked := len(req.TransferEncoding) > 0 && req.TransferEncoding[0] == "chunked"
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if len(req.TransferEncoding) > 0 {
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fmt.Fprintf(&b, "Transfer-Encoding: %s\r\n", strings.Join(req.TransferEncoding, ","))
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fmt.Fprintf(&b, "Connection: close\r\n")
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err = req.Header.WriteSubset(&b, reqWriteExcludeHeaderDump)
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io.WriteString(&b, "\r\n")
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var dest io.Writer = &b
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dest = NewChunkedWriter(dest)
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_, err = io.Copy(dest, req.Body)
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dest.(io.Closer).Close()
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io.WriteString(&b, "\r\n")
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// DumpResponse is like DumpRequest but dumps a response.
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func DumpResponse(resp *http.Response, body bool) (dump []byte, err error) {
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savecl := resp.ContentLength
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if !body || resp.Body == nil {
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resp.ContentLength = 0
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save, resp.Body, err = drainBody(resp.Body)
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resp.ContentLength = savecl
added
removed
http13client/httputil/dump.go
