title: what does the http keep alive affect on tcp connection?
body: <p>On http persistent there is a "keep alive" timer.</p>
  
  <p>When the keep alive time is over , what happend?
  the tcp connection will close? i don't think so because there is keep alive on tcp connection that exsist.</p>
  
  <p>so what is the affect of "keep alive http timer"?</p>
  
  <p>If i open http connection to url (TCP) on port 80 , 
  the port of server will not be  free until the tcp connection will end.</p>
  
  <p>so what if the http keep alive end?</p>
  
  <p>I tried to understand that .</p>
  
  <p>i will be happy if i get an official source to this .</p>
  
  <p>thanks!</p>