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    <p>For a general discussion of how network programming is done, see <a href="https://stackoverflow.com/questions/27179/c-network-programming">this question</a>. </p> <p>The short answer to your specific question is that receiving a server's response (within a browser) is different from receiving a browser's request (within a server). When the browser opens a new connection to the server, what it's doing is creating a socket and then calling <code>connect</code> and <code>send</code> on that socket. When the server gets this incoming connection, it might not care if this is the same client as some previous connection. If does care (e.g. it has logged-in sessions or shopping carts) it has to use cookies or whatnot if to associate this connection with previous ones. (I'm ignoring persistent connections, which are beyond the scope of your question.)</p> <p>But when the browser receives the response from the server, it does so by calling <code>recv</code> on the same socket that it used to send the request, so it knows which request that response goes with before it even starts reading it. In theoretical terms, the browser is maintaining state information about the connections it has open. In practical terms, it has a list or array of sockets.</p> <p>The browser also keeps track of which windows and tabs are associated with which sockets. This is how it can update the spinners and status lines to reflect the status of the corresponding connections. And if the user clicks the stop button, it knows which socket (or sockets) to close.</p> <p>So in your scenario, the user has clicked a link or bookmark in a window or tab associated with an existing socket representing a connection to a server where the server's response hasn't been received yet. The browser can simply close that socket as if the user had clicked the stop button. And even if it didn't close it, the browser knows the user no longer wants to see the response. Meanwhile it opens a new socket to the server the user is interested in.</p>
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    1. POQuestion regarding browser behavior when a response is sent from a server
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    1. USgatkin
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    1. COWait, how did you only get a 25 point bounty?
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      1. USAaron Yodaiken
    2. COThe FAQ says if the bounty isn't awarded within 7 days (by whoever offered it) then half the amount is automatically awarded to a question that meets certain conditions. I assume that's what happened.
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    3. COmy apologies. Didn't visit the site till today. Have added another bounty and will award it to this answer tomorrow.
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      1. USVivek Kodira
 

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