Intercepting

In the Interceptor tab you can process requests and responses from the server and then forward them. This is very useful if you want to manipulate data that is sent to the web server in the background, which is not possible via the browser.

To intercept all requests, you just have to switch on intercepting in the upper right corner.
After that you will see all requests as soon as you visit e.g. a website.
Intercepting Tool

If a request is intercepted, you can edit it and then forward it. You also have the option to cancel the request and not send it to the server. In the browser you will see a message from SSLProx that the request was dropped. Intercepted Request