XMLHTTP readystate

Previous post has mentioned about XMLHTTP. onreadystatechange event fire up at several stages which allow response handling. Generally readystate has the following values:

0	Uninitialised	before open() is called
1	Request has set up	before send() is called
2	Request was sent and in process	content header is available
3	In process	responseText holds partial data but unfinished
4	Complete	finish processing and received response

P.S. according to QuirksBlog: XMLHTTP notes: readyState and the events, different browsers behave differently for onreadystatechange event handling.