I'm happy to inform you that first application use Advanced Rest Client API to extend its functionality. REST Sniffer is an extension to debug API calls for Facebook, Twitter and whatever endpoint you define. When Sniffer recognize a request it displays it attributes in new tab in chrome inspector. There you can load the request in Advanced Rest Client application.
You can install REST Sniffer from Chrome Web Store https://chrome.google.com/webstore/detail/rest-sniffer/ifeiedjadmeabnlahklpafjbomkcklbj
Looking forward to hear feedback from you :)