Noel Burton-Krahn wrote:
I have Apache-1.3.26 proxying requests to another back-end http server. If the client cancels a connection while sending the parameters, the proxied server does not see the connection close, and it hangs.
1. start a long file upload request 2. apache opens a new connection to the back-end 3. client cancells upload 4. the connection to apache closes 5. apache blocks reading the request from the back-end 6. since apche doesn't call shutdown() on the socket connected to the back-end, the back-end server doesn't know the client broke the connection and hangs waiting for more input.
As far as I was aware proxy already did this - will look further into why this is broken.
In the bigger scheme of things, its a bad idea for a proxy server to buffer a whole request before reading the reply.
The point behind buffering a whole or part of a request is to ensure slow clients don't tie up resources on expensive backend processes. Doing it this way has a significant performance advantage.
Could mod_proxy be redone to pipe both sides at once?
This isn't a proxy limitation, but rather a limitation on the way the filter stacks work. This problem has been highlighted before, and there was some discussion not so long ago on fixing it, though I'm not sure when it will happen :(
Regards,
Graham
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