I'd add that one of the best features of XHR Poster is that it uses your cookies and any authentication you've already performed in Chrome when sending the requ

I'd add that one of the best features of XHR Poster is that it uses your cookies and any authentication you've already performed in Chrome when sending the requests. I had to build an API that lived inside a system with entirely too many authentication/cookie checks and using curl was becoming too awkward for testing, this saved me a lot of time.