GM_xmlhttpRequest POST bug Rated 5 out of 5 stars

In firefox 3.0.3 and greasemonkey Greasemonkey 0.8.20080609.0,
when you use GM_xmlhttpRequest to post some data, nothing was received at the server side,
until you set:
headers: {"Content-Type":"application/x-www-form-urlencoded"}

This review is for a previous version of the add-on (0.8.20080609.0).