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Package httpmitm

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The latest major version is .

Published: Aug 1, 2020 | License: Apache-2.0 | Module:




package main

import (

func getBody(s string) (body []string) {
	pastHeaders := false
	for _, part := range strings.Split(s, "\r\n") {
		if pastHeaders {
			body = append(body, part)
		} else if part == "" {
			pastHeaders = true

func main() {
	// Setup test server.
	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("Hello, Client!"))
	defer ts.Close()

	// Setup instrumented client.
	type record struct {
		o Origin
		d string
	var records []*record
	client := http.Client{
		Transport: &Transport{
			Callback: func(o Origin, data []byte, err error) {
				records = append(records, &record{o, string(data)})

	_, err := client.Post(ts.URL, "test", bytes.NewBufferString("Hail, Server!"))
	if err != nil {

	// There should be two records: request and response.
	for idx, r := range records {
		fmt.Printf("%d) %s\n", idx, r.o)
		for _, line := range getBody(r.d) {

0) Request
Hail, Server!
1) Response
Hello, Client!



type Callback

type Callback func(Origin, []byte, error)

Callback is a callback method that is invoked during HTTP communications to forward captured data.

type Origin

type Origin uint

Origin is an enumeration used to annotate which type of data is being fed to the callback.

const (
	Request Origin = iota

Log transport types.

func (Origin) String

func (t Origin) String() string

String converts a Origin to a user-friendly string.

type Transport

type Transport struct {
	// Underlying RoundTripper; uses http.DefaultTransport if nil.

	Callback Callback // Output callback.

Transport is an implementation of http.RoundTripper that logs outgoing requests and incoming responses.

func (*Transport) RoundTrip

func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error)

RoundTrip implements the http.RoundTripper interface.

Package Files

Documentation was rendered with GOOS=linux and GOARCH=amd64.

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