WebSpy is a powerful Chrome extension that allows you to monitor HTTP GET/POST requests and explore websites. With built-in XML/JSON viewers and formatters, you can easily view and format the request and response body. The extension also functions as a REST client, allowing you to send GET/POST/PATCH requests and customize all aspects of the request and response in various formats such as XML, JSON, HTML, and text. WebSpy is an essential tool for API testing and analysis, and it provides a convenient way to optimize and test your website.