Relay is a versatile open-source Chrome extension designed for developers and testers to capture, modify, and run HTTP requests directly within the browser. This tool requires no account setup, allowing users to install and start working immediately. Key functionalities include real-time interception of HTTP and HTTPS traffic, with the ability to filter requests by method or URL, ensuring that users can focus on the most relevant data during their browsing sessions.

In addition to capturing requests, Relay offers robust editing capabilities, enabling users to modify request details such as URL, HTTP method, headers, and body content on-the-fly. It also facilitates API testing by allowing direct execution of requests in the browser, providing immediate feedback without the need for external applications. Users can save their sessions for future reference, making it easy to revisit and analyze past requests.