What is RequestB.in?
RequestBin gives you a URL that will collect requests made to it and let you inspect them in a human-friendly way. Use RequestBin to see what your HTTP client is sending or to inspect and debug webhook requests.
The hosted version of RequestBin (http://requestb.in/) was discontinued in March 2018 due to ongoing abuse that made it very difficult to keep the site up reliably. The source is still available to set up your own self-hosted instance.