I use the GWT Frame to Develop

It also based on ajax

I encountered a problem.

I was doing comet(pub/sub) code

when I send a ajax(POST method) to server wait.

If not data transmission in HTML!
I found the browser(IE) would turn off the ajax thread after 1 hours

Is it true?

When HTML send a ajax Thread to server wait.
if not notify this Thread

 how long is the maximum time as IE???
 how long is the maximum time as Chorme?
 how long is the maximum time as fireFox?
how long is the maximum time as Opera?

If you know the answer could you sent to my mailbox ?
"wangzi5610099 at gmail dot com"
Thanks very much!