Charles is a web proxy (HTTP Proxy / HTTP Monitor) that runs on your own computer. Your web browser (or any other Internet application) is then configured to access the Internet through Charles, and Charles is then able to record and display for you all of the data that is sent and received.

Packaged as a Chrome extension and accessible from any modern web browser, Restlet Studio instantly provides to any developer powerful API crafting capabilities. Through an intuitive interface, developers can visually define all the elements of a web API, and automatically generate the client SDK and server skeleton of their API.