Private modules

Private modules are Go packages that cannot be accessed by other modules unless explicitly allowed via the GOPRIVATE environment variable or go.mod directives. To configure private modules, set the GOPRIVATE environment variable to include the import paths of your private repositories, ensuring the Go toolchain bypasses the public proxy for those paths. For example, add GOPRIVATE=example.com/private/* to your shell configuration or run go env -w GOPRIVATE=example.com/private/* to set it for your current session.

Private modules are code repositories that you keep hidden from the public internet, similar to a private folder on your computer that only you can open. You tell the Go tool which paths are private so it doesn't try to download them from a public server, preventing errors when building your project. This is essential for working with internal company libraries or sensitive code that shouldn't be shared.