How to Configure Go to Use a Proxy for Package Installation?

Using Proxies for Go Commands

Context:

When installing packages using the go install command, you may encounter the need to connect through a proxy server for internet access. This guide will demonstrate how to configure Go to utilize a proxy.

Environment Variables:

Go programs inherently recognize the HTTP_PROXY and NO_PROXY environment variables. However, this alone is insufficient because packages are often retrieved from source control managers such as Mercurial and Git. To address this, you must configure proxy settings for the respective SCMs as well.

Setting Proxy Settings:

• Mercurial: Use this command hg config http.proxy http://proxy.example.com:8080.
• Git: Use this command git config --global http.proxy http://proxy.example.com:8080.

Environment Variable Values:

• HTTP_PROXY: The proxy address in the format http://user:password@host:port/. User, password, and port are optional.
• NO_PROXY: A comma-separated list of servers that should bypass the proxy. For example: foo.com,bar.net:4000.

Integrating into Shell Environment:

You can set these environment variables permanently in your shell profile (e.g., .bashrc, .zshrc). Alternatively, you can temporarily set them for specific go commands:

$ http_proxy=127.0.0.1:8080 go get code.google.com/p/go.crypto/bcrypt

Creating an Alias:

If you frequently use a proxy, you can create an alias to simplify the process:

$ alias go='http_proxy=127.0.0.1:8080 go'

This allows you to use the go command normally while automatically connecting through your designated proxy.

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