I'm looking for an answer to your questions as well, so if you do find a 
solution on other lists, could you please post it here as well?

Regarding the issue, your proposal wouldn't make for full-duplex as far 
as I understand since I don't see how the client would be able to send 
any data on the same connection _after_ getting connected.

What are you using on the other end of the pipe (on the client)? Plain 
HTML? Flash? Java? Something else?


Vinod Panicker wrote:

> Hi,
> We have developed a client-server application where the server needs 
> to send asynchronous data to the client.  Now since we are using 
> Apache/PHP/MySQL, the client needs to poll the server periodically for 
> information.
> I was thinking if there was some way to get around this basic 
> problem.  I understand that this is how things are supposed to work, 
> but it would be just great if i could PUSH data from the server to the 
> client, using HTTP.
> Since HTTP is a request/response based protocol, Apache would not send 
> any data to the client asynchronously.  So what i was thinking was - 
> If i tell the server to allow Keep-Alive connections, and increase the 
> timeout value and max requests, I would effectively have a constant 
> TCP connection.  Now the only problem would be of sending asynchronous 
> data to the client.  Solution?  Here goes - If there was some way in 
> which i could get hold of the file descriptor(socket) that is being 
> used by apache to write data to the client, then i could, from a PHP 
> script also send any data to the client using the socket functions of 
> PHP since i already have the socket with me.
> This would mean that the client doesnt have to poll the server for 
> data any more... and if the connection does get closed, the client 
> could reconnect to the server asking for another keep-alive connection.
> Now I know that this is probably the wrong place to put such a query - 
> maybe the apache list would have been better.  But since I'm using PHP 
> out here, i thought i'd give it a try.
> Does the solution sound very outlandish?  Are there any pitfalls?  And 
> finally, how do i get hold of the socket?
> Tx in advance,
> Vinod.
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