Golang: how to read response body of ReverseProxy?

Question

package main

import (
    \"net/http\"
    \"net/http/httputil\"
    \"net/url\"
)

func main() {
    target := &url.URL{Scheme: \"http\", Host: \"www.google.com\"}         


        

Answer 1

httputil.ReverseProxy has a Transport field. You can use it to modify the response. For example:

type transport struct {
    http.RoundTripper
}

func (t *transport) RoundTrip(req *http.Request) (resp *http.Response, err error) {
    resp, err = t.RoundTripper.RoundTrip(req)
    if err != nil {
        return nil, err
    }
    b, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        return nil, err
    }
    err = resp.Body.Close()
    if err != nil {
        return nil, err
    }
    b = bytes.Replace(b, []byte("server"), []byte("schmerver"), -1)
    body := ioutil.NopCloser(bytes.NewReader(b))
    resp.Body = body
    resp.ContentLength = int64(len(b))
    resp.Header.Set("Content-Length", strconv.Itoa(len(b)))
    return resp, nil
}

// ...
proxy := httputil.NewSingleHostReverseProxy(target)
proxy.Transport = &transport{http.DefaultTransport}

Playground example of the whole thing: http://play.golang.org/p/b0S5CbCMrI.