How to Configure Proxies for Go's HTTP Client?

Proxy Configuration for Go HTTP Client

Many HTTP client applications require the use of a proxy to access websites or services. Go provides flexibility in setting up proxy configurations for its HTTP client.

Default Proxy Configuration

To use a proxy automatically, you can set the following environment variable:

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

Alternatively, you can use the os package in Go:

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

Custom Proxy Configuration

If you need more granular control over proxy configuration, you can create a custom HTTP client that explicitly uses a proxy:

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

You can use this custom client to make requests:

resp, err := myClient.Get("http://example.com")

Modifying Default Transport

Another option is to modify the default transport used by the net/http package:

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

This configuration affects all HTTP requests made by your program, using the default HTTP client or custom clients that do not specify a proxy.

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