The concept of http persistent and non-persistent

pls somebody explain me the concept of "keepalive type http".
when and where configure the persistent and non-persistent? not clear from the doc that HTTP-head, HTTP-get, classA and classB.
Thanks in advance.

Persistent will use HTTP version 1.1 while non-persistent will use version 1.0.
Use non-persistent only if your server does not support http version 1.1.
HTTP method HEAD or GET is selected with the command 'keepalive method'.
A head does not require the server to send us the content of the requested file, but simply an acknowledgement that the file is available.
The GET will request the complete file from the server and the CSS will verify that the content did not change compare to first GET request.
Again, I would recommend the default - head, unless you believe somebody could corrupt the content of your website.
Regards,
Gilles.

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