RESTOnIt is a pure-Cocoa client for testing HTTP Web servers and applications on Mac OS X. It is especially helpful for testing REST Web services, but it comes in handy anywhere precise information about incoming and outgoing HTTP messages is needed. It features an attractive, functional request/response UI, integrating seamlessly into the Mac environment.
What's new in RESTOnIt
Added a history viewer.
Request history is now persistent between app launches.
Help → Report a Bug opens the RESTOnIt support page instead of a new email.
Added support for Sudden and Automatic Termination in OS X 10.7 or later.
The full request URL is shown in a tooltip in the history drawer.
Fixed application hangs with very large responses by implementing a 1 MB response limit.
Fixed some drawing glitches in the response pane.
Fixed a bug where the response would show up incorrectly when a new request was issued before it could be received.
Response line view has no color when a request is cancelled.