How to build a proxy server in golang

In recent years, due to more and more network restrictions, the demand for proxy servers has gradually increased. As an efficient, concise, and excellent programming language with excellent concurrency performance, golang also has great advantages when building proxy servers. This article will introduce how to use golang to build a simple proxy server.

Step one: Create a new project

First you need to use golang’s command line tool to create a new project. Enter the following command on the command line to create a new project:

mkdir proxy && cd proxy
go mod init proxy

The function of these two lines of commands is to create a new folder named "proxy" and create a new folder inside it. go.mod file, which records project dependency information.

Step 2: Introduce dependencies

Since we need to use network-related functions in the project, we need to introduce the following dependencies:

import (
  "log"
  "net"
  "net/http"
  "net/http/httputil"
)

Among themlog is used for logging, net is used for network connection and address resolution, http and httputil are used for processing HTTP request and response data respectively.

Step 3: Write the proxy server

The specific code is implemented as follows:

func main() {
  proxy := httputil.NewSingleHostReverseProxy(&url.URL{
    Scheme: "https",
    Host:   "www.google.com",
  })

  server := http.Server{
    Addr: ":8080",
    Handler: proxy,
  }

  log.Fatal(server.ListenAndServe())
}

Code interpretation:

First create a proxy named proxy 's http reverse proxy, and specify the proxy address as https://www.google.com. Then create a http server named server, listen on port 8080, and set proxy as the handler function to handle all requests. Finally, the proxy server is started via server.ListenAndServe().

Step 4: Test the proxy server

Go back to the command line and run the following command to start the server:

go run main.go

After successful startup, you can use a browser or other HTTP client Conduct proxy testing.

For example, enter http://localhost:8080 in the browser, and then you can experience the convenience brought by the proxy server built with golang.

Summary:

In this article, we use the golang programming language to build a simple proxy server. Although this example is very simple, it demonstrates the simplicity and efficiency of the golang language and how to use golang for network programming. I hope that through the introduction of this article, readers can have a certain understanding of the golang programming language and have the ability to operate it in practice.

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