Is it assumed that the ajax call closes the tcp session at the calls completion (I see an open for ajax but no close)?

I ask because ....

My jquery application is being used by a micro running my own web server.

As of today, I limit the number of open sockets (tcp connections) to 3 for performance and resource concerns.

When Chrome opens a page on my web server -- it automatically open 3 sockets and uses them to transfer all aspects of the web page.

My Page -- will load data via ajax after the html and other files are loaded .. Chrome (browser) may have all 3 sockets utilized.  That's why I ask --- if the browser handles the agax call -- it may use one of the 3 existing sockets.  If not --- I have some pondering to do -- since currently -- the web server keeps a socket alive for 15 seconds of inactivity before it closes it.

Thanks for any insight.

Joe