HTTP server detecting a broken network connection from a HTTP client

I have an web application in which after making a HTTP request to the server, the client quits ( or network connection is broken) before the response was completely received by the client.

In this scenario the server side of the applica开发者_如何转开发tion needs to do some cleanup work. Is there a way built into HTTP protocol to detect this condition. How does the server know if the client is still waiting for the response or has quit?

Thanks Vijay Kumar

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No, there is nothing built in to the protocol to do this (after all, you can't tell whether the response has been received by the client itself yet, or just a downstream proxy).

Just have your client make a second request to acknowledge that it has received and stored the original response. If you don't see a timely acknowedgement, run the cleanup.

However, make sure that you understand the implications of the Two Generals' Problem.

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You might have a network problem... usualy, when you send a HTTP request to the server, first you send headers and then the content of the POST (if it is a post method). Likewise, the server responds with the headers and document body. The first line in the header is the status. Usually, status 200 is the success status, if you get that, then there should be no problem getting the rest of the document. Check this for details on the HTTP response status headers http://www.w3.org/Protocols/rfc2616/rfc2616-sec6.html

LE: Sorry, missread your question. Basically, you don't have a trigger for when the user disconnects. If you use OOP, you could use the destructor of a class to clean whatever it is you need to clean.