An HTTP proxy library for Go
Alternatives To Goproxy
Project NameStarsDownloadsRepos Using ThisPackages Using ThisMost Recent CommitTotal ReleasesLatest ReleaseOpen IssuesLicenseLanguage
Node Http Proxy13,281398,0652,9323 days ago103May 17, 2020577otherJavaScript
A full-featured http proxy for node.js
Whistle11,9851117a day ago539September 13, 202227mitJavaScript
HTTP, HTTP2, HTTPS, Websocket debugging proxy
Hotel9,861973 months ago83June 17, 2018124mitJavaScript
🏩 A simple process manager for developers. Start apps from your browser and access them using local domains
Anyproxy7,19373131a year ago176June 18, 2020241apache-2.0JavaScript
A fully configurable http/https proxy in NodeJS
Goproxy5,2591,8631,258a month agoJuly 25, 2018208bsd-3-clauseGo
An HTTP proxy library for Go
Redbird4,21875552 years ago67December 17, 2019123bsd-2-clauseJavaScript
A modern reverse proxy for node
9 hours ago289otherC
HAProxy Load Balancer's development branch (mirror of
Nginx Tutorial3,032
2 months ago5cc-by-sa-4.0JavaScript
这是一个 Nginx 极简教程,目的在于帮助新手快速入门 Nginx。
2 months ago1February 27, 201869C
transparent TCP-to-proxy redirector
Fq Book2,675
14 days agoShell
📖《网络代理与VPN应用详解》 详细阐述代理、隧道、VPN运作过程,并对GFW策略如:地址端口封锁、服务器缓存投毒、数字验证攻击、SSL连接阻断做相关的原理说明
Alternatives To Goproxy
Select To Compare

Alternative Project Comparisons


GoDoc Join the chat at Status

Package goproxy provides a customizable HTTP proxy library for Go (golang),

It supports regular HTTP proxy, HTTPS through CONNECT, and "hijacking" HTTPS connection using "Man in the Middle" style attack.

The intent of the proxy is to be usable with reasonable amount of traffic, yet customizable and programmable.

The proxy itself is simply a net/http handler.

In order to use goproxy, one should set their browser to use goproxy as an HTTP proxy. Here is how you do that in Chrome and in Firefox.

For example, the URL you should use as proxy when running ./bin/basic is localhost:8080, as this is the default binding for the basic proxy.

Mailing List

New features will be discussed on the mailing list before their development.

Latest Stable Release

Get the latest goproxy from

Why not Fiddler2?

Fiddler is an excellent software with similar intent. However, Fiddler is not as customizable as goproxy intends to be. The main difference is, Fiddler is not intended to be used as a real proxy.

A possible use case that suits goproxy but not Fiddler, is gathering statistics on page load times for a certain website over a week. With goproxy you could ask all your users to set their proxy to a dedicated machine running a goproxy server. Fiddler is a GUI app not designed to be run like a server for multiple users.

A taste of goproxy

To get a taste of goproxy, a basic HTTP/HTTPS transparent proxy

package main

import (

func main() {
    proxy := goproxy.NewProxyHttpServer()
    proxy.Verbose = true
    log.Fatal(http.ListenAndServe(":8080", proxy))

This line will add X-GoProxy: yxorPoG-X header to all requests sent through the proxy

    func(r *http.Request,ctx *goproxy.ProxyCtx)(*http.Request,*http.Response) {
        return r,nil

DoFunc will process all incoming requests to the proxy. It will add a header to the request and return it. The proxy will send the modified request.

Note that we returned nil value as the response. Had we returned a response, goproxy would have discarded the request and sent the new response to the client.

In order to refuse connections to reddit at work time

    func(r *http.Request,ctx *goproxy.ProxyCtx)(*http.Request,*http.Response) {
        if h,_,_ := time.Now().Clock(); h >= 8 && h <= 17 {
            return r,goproxy.NewResponse(r,
                    "Don't waste your time!")
        return r,nil

DstHostIs returns a ReqCondition, that is a function receiving a Request and returning a boolean. We will only process requests that match the condition. DstHostIs("") will return a ReqCondition accepting only requests directed to "".

DoFunc will receive a function that will preprocess the request. We can change the request, or return a response. If the time is between 8:00am and 17:00pm, we will reject the request, and return a pre-canned text response saying "do not waste your time".

See additional examples in the examples directory.

Type of handlers for manipulating connect/req/resp behavior

There are 3 kinds of useful handlers to manipulate the behavior, as follows:

// handler called after receiving HTTP CONNECT from the client, and before proxy establish connection 
// with destination host
httpsHandlers   []HttpsHandler
// handler called before proxy send HTTP request to destination host
reqHandlers     []ReqHandler 
// handler called after proxy receives HTTP Response from destination host, and before proxy forward 
// the Response to the client.
respHandlers    []RespHandler 

Depending on what you want to manipulate, the ways to add handlers to each handler list are:

// Add handlers to httpsHandlers 
proxy.OnRequest(Some ReqConditions).HandleConnect(YourHandlerFunc())

// Add handlers to reqHandlers
proxy.OnRequest(Some ReqConditions).Do(YourReqHandlerFunc())

// Add handlers to respHandlers
proxy.OnResponse(Some RespConditions).Do(YourRespHandlerFunc())

For example:

// This rejects the HTTPS request to * during HTTP CONNECT phase

// This will NOT reject the HTTPS request with URL ending with gif, due to the fact that proxy 
// only got the URL.Hostname and URL.Port during the HTTP CONNECT phase if the scheme is HTTPS, which is
// quiet common these days.

// The correct way to manipulate the HTTP request using URL.Path as condition is:

What's New

  1. Ability to Hijack CONNECT requests. See the eavesdropper example
  2. Transparent proxy support for http/https including MITM certificate generation for TLS. See the transparent example.


I put the software temporarily under the Go-compatible BSD license. If this prevents someone from using the software, do let me know and I'll consider changing it.

At any rate, user feedback is very important for me, so I'll be delighted to know if you're using this package.

Beta Software

I've received positive feedback from a few people who use goproxy in production settings. I believe it is good enough for usage.

I'll try to keep reasonable backwards compatibility. In case of a major API change, I'll change the import path.

Popular Proxy Projects
Popular Https Projects
Popular Networking Categories

Get A Weekly Email With Trending Projects For These Categories
No Spam. Unsubscribe easily at any time.