jeffwidman/goproxy

GoProxy is a tool for developers who need to build a custom web proxy server using the Go programming language. A proxy acts as a middleman between a user's web browser and the websites they visit. Instead of connecting directly to a website, the browser sends its traffic through the proxy, which can then inspect, modify, or block the data before passing it along. This lets you program exactly how web traffic should be handled. The way it works is by intercepting web requests and responses at three key moments: when a secure connection is being set up, right before a request is sent to its destination, and right after the response comes back. At any of these stages, you can write rules for what the proxy should do. For example, you could add a custom tracking label to every request passing through, or block access to specific websites during certain hours of the day. You can also target specific websites so the proxy only takes action on traffic going to those addresses. This library is designed for developers building tools that need to intercept, monitor, or manipulate web traffic. A practical use case would be a company wanting to block social media sites during working hours, or a security team inspecting web requests for suspicious patterns before they reach an internal server. It supports "man-in-the-middle" inspection of secure HTTPS traffic, meaning it can generate its own certificates to look inside encrypted web traffic and modify it if needed. What makes this project notable is its maturity and trust. It has been around for over a decade, is actively maintained, and is relied upon by major companies including Stripe, Google, and Kubernetes. It is built to handle production-level traffic and is licensed for commercial use, making it a safe choice for businesses. The maintainers also emphasize that it is highly customizable, allowing developers to plug in their own logging tools or custom network settings as needed.