func (f *Forwarder) ServeHTTP(w http.ResponseWriter, req *http.Request) {
start := time.Now().UTC()
response, err := f.roundTripper.RoundTrip(f.copyRequest(req, req.URL))
if err != nil {
f.log.Errorf("Error forwarding to %v, err: %v", req.URL, err)
f.errHandler.ServeHTTP(w, req, err)
return
}
if req.TLS != nil {
f.log.Infof("Round trip: %v, code: %v, duration: %v tls:version: %x, tls:resume:%t, tls:csuite:%x, tls:server:%v",
req.URL, response.StatusCode, time.Now().UTC().Sub(start),
req.TLS.Version,
req.TLS.DidResume,
req.TLS.CipherSuite,
req.TLS.ServerName)
} else {
f.log.Infof("Round trip: %v, code: %v, duration: %v",
req.URL, response.StatusCode, time.Now().UTC().Sub(start))
}
utils.CopyHeaders(w.Header(), response.Header)
w.WriteHeader(response.StatusCode)
written, _ := io.Copy(w, response.Body)
if written != 0 {
w.Header().Set(ContentLength, strconv.FormatInt(written, 10))
}
response.Body.Close()
}
func (f *Forwarder) copyRequest(req *http.Request, u *url.URL) *http.Request {
outReq := new(http.Request)
*outReq = *req // includes shallow copies of maps, but we handle this below
outReq.URL = utils.CopyURL(req.URL)
outReq.URL.Scheme = u.Scheme
outReq.URL.Host = u.Host
outReq.URL.Opaque = req.RequestURI
// raw query is already included in RequestURI, so ignore it to avoid dupes
outReq.URL.RawQuery = ""
// Do not pass client Host header unless optsetter PassHostHeader is set.
if f.passHost != true {
outReq.Host = u.Host
}
outReq.Proto = "HTTP/1.1"
outReq.ProtoMajor = 1
outReq.ProtoMinor = 1
// Overwrite close flag so we can keep persistent connection for the backend servers
outReq.Close = false
outReq.Header = make(http.Header)
utils.CopyHeaders(outReq.Header, req.Header)
if f.rewriter != nil {
f.rewriter.Rewrite(outReq)
}
return outReq
}