// Standard net/http function. Shouldn't be used directly, http.Serve will use it.
func (proxy *ProxyHttpServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
//r.Header["X-Forwarded-For"] = w.RemoteAddr()
if r.Method == "CONNECT" {
proxy.handleHttps(w, r)
} else {
ctx := &ProxyCtx{Req: r, Session: atomic.AddInt64(&proxy.sess, 1), proxy: proxy}
var err error
ctx.Logf("Got request %v %v %v %v", r.URL.Path, r.Host, r.Method, r.URL.String())
if !r.URL.IsAbs() {
proxy.NonproxyHandler.ServeHTTP(w, r)
return
}
r, resp := proxy.filterRequest(r, ctx)
if resp == nil {
removeProxyHeaders(ctx, r)
resp, err = ctx.RoundTrip(r)
if err != nil {
ctx.Error = err
resp = proxy.filterResponse(nil, ctx)
if resp == nil {
ctx.Logf("error read response %v %v:", r.URL.Host, err.Error())
http.Error(w, err.Error(), 500)
return
}
}
ctx.Logf("Received response %v", resp.Status)
}
origBody := resp.Body
resp = proxy.filterResponse(resp, ctx)
ctx.Logf("Copying response to client %v [%d]", resp.Status, resp.StatusCode)
// http.ResponseWriter will take care of filling the correct response length
// Setting it now, might impose wrong value, contradicting the actual new
// body the user returned.
// We keep the original body to remove the header only if things changed.
// This will prevent problems with HEAD requests where there's no body, yet,
// the Content-Length header should be set.
if origBody != resp.Body {
resp.Header.Del("Content-Length")
}
// Throttle response reader
var reader io.Reader
if proxy.TokenBucket != nil {
reader = ratelimit.Reader(resp.Body, proxy.TokenBucket)
} else {
reader = resp.Body
}
copyHeaders(w.Header(), resp.Header)
w.WriteHeader(resp.StatusCode)
nr, err := io.Copy(w, reader)
if err := resp.Body.Close(); err != nil {
ctx.Warnf("Can't close response body %v", err)
}
ctx.Logf("Copied %v bytes to client error=%v", nr, err)
}
}
func NewRateLimitReader(rc io.ReadCloser, rate float64, capacity int64) io.ReadCloser {
var rlr rateLimitReader
rlr.rc = rc
rlr.rlr = ratelimit.Reader(rc, ratelimit.NewBucketWithRate(rate, capacity))
return &rlr
}