I'm trying to work around a timeout problem which one of my user's proxy server has. The proxy's timeout is set to 1 minute. Should it not receive any HTTP traffic for 1 minute it disconnects. One of my JSPs takes >1 minute to perform processing and return results. What I'm trying to do is... 1) Flush out HTTP headers immediately 2) (Start my database operation which takes >1 minute) 3) Write out and flush to the client a HTML comment (<!--hello-->) every 10 seconds while the database operation completes to stop the proxy timing out 4) (Database operation completes) 5) Write out results By calling response.flushBuffer() immediately at the top of my JSP, the HTTP headers are being written out to the TCP stream. So far, so good. My code then, every 10 seconds, does an out.print("<!-- hello -->") and a response.flushBuffer(). By using a packet sniffer I can see that although the headers get output to the TCP stream, the "body" of the HTTP response does not get written out until the very end of the execution of the JSP. The only way I can get the buffer to flush is if I do an out.print with a string greater than 8192 characters (the default size of the buffer). Note that I also tried out.flush() and that doesn't work either. As a workaround I tried to set the buffer size artificially low, but this call is being ignored: System.out.println(response.getBufferSize()); // buffer size of 8192 printed to stdout response.setBufferSize(100); // buffer size should now be 100, right? System.out.println(response.getBufferSize()); // buffer size of 8192 still printed to stdout setBufferSize only works if I set the buffer > 8192. I can't find any reference in the Tomcat spec to this being a deliberate behavior, or a hard-coded minimum? Anyone got any ideas of where I'm going wrong, or how I might get this to work in Tomcat 5.5.9? (Note that I'm stuck at Tomcat 5.5.9 because the later (Apache) HTTPS implementations don't work reliably in our environment). Thanks, Richard
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