How Can I Configure a Go HTTP Client to Use a Proxy Server?

Setting Up Proxy for HTTP Client

Using a proxy server with an HTTP client can enhance privacy or enable access to restricted resources. Go provides multiple methods to establish a proxy configuration for HTTP requests.

Using HTTP_PROXY Environment Variable

Lukas's suggestion is straightforward. Setting the HTTP_PROXY environment variable to the desired proxy address (e.g., "http://proxyIp:proxyPort") will cause Go's HTTP client to automatically use that proxy.

Bash:

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

Go:

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

Constructing a Custom HTTP Client with Proxy

For cases where the environment variable cannot be modified or cannot be relied upon, a custom HTTP client with a designated proxy can be created:

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

Modifying the Default HTTP Transport

This approach affects the gesamten program, ensuring that all HTTP requests use the specified proxy:

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

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