Webhook Tester : Webhook Tester allows you to easily test webhooks and other types of HTTP requests.
patchbay : patchbay.pub is a free web service you can use to implement things like static site hosting, file sharing, cross-platform notifications, webhooks hand...
Requestdiff : Differentiate HTTP headers and content body of two GET URLs.
drest : Configurable HTTP/REST Client Library for Python
CouchDB : Apache CouchDB™ is a database
that uses JSON for documents,
JavaScript for MapReduce indexes,
and regular HTTP for its API
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.