I've seen a couple questions around here like How to debug RESTful services, which mentions:

  
Unfortunately that same browser won't allow me to test HTTP PUT, DELETE, and to a certain degree even HTTP POST.

I've also heard that browsers support only GET and POST, from some other sources like:

• http://www.packetizer.com/ws/rest.html
• http://www.mail-archive.com/[email protected]/msg13518.html
• http://www.xml.com/cs/user/view/cs_msg/1098

However, a few quick tests in Firefox show that sending PUT and DELETE requests works as expected -- the XMLHttpRequest completes successfully, and the request shows up in the server logs with the right method. Is there some aspect to this I'm missing, such as cross-browser compatibility or non-obvious limitations?