How to Use a Proxy Server with Go's HTTP Client?

Setting up a Proxy for HTTP Client in Go

Question:

How to configure an HTTP client in Go to use a proxy server for all requests?

Answer:

There are multiple approaches to setting up a proxy for an HTTP client in Go.

• Using Environment Variable:

  You can set the HTTP_PROXY environment variable to specify the address of the proxy server. When Go establishes an HTTP connection, it will automatically detect and use the proxy settings from the environment.

  Bash:

  export HTTP_PROXY="http://proxyIp:proxyPort"

  Go:

  os.Setenv("HTTP_PROXY", "http://proxyIp:proxyPort")

• Using Custom HTTP Client:

  You can create your own http.Client object with a custom transport that uses the specified proxy server.

  proxyUrl, err := url.Parse("http://proxyIp:proxyPort")
  myClient := &http.Client{
      Transport: &http.Transport{
          Proxy: http.ProxyURL(proxyUrl),
      },
  }

• Modifying Default HTTP Transport:

  You can modify the default HTTP transport used by the net/http package to force all HTTP requests to use the proxy.

  proxyUrl, err := url.Parse("http://proxyIp:proxyPort")
  http.DefaultTransport = &http.Transport{
      Proxy: http.ProxyURL(proxyUrl),
  }

This ensures that every HTTP request made using http.Client{} or any package that relies on net/http will automatically use the specified proxy.

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