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copied!<p>No complete answer, but:</p> <p>In your question, you're describing a <a href="http://en.wikipedia.org/wiki/Comet_(programming)" rel="nofollow noreferrer">Comet</a>-style architecture. Regarding support of Comet-style techniques in Python/WSGI, there is a <a href="https://stackoverflow.com/questions/960969/python-comet-server">StackOverflow question</a>, which talks about various Python servers with support for long-running requests a la Comet.</p> <p>Also interesting is this mail thread in the Python Web-SIG: <a href="http://mail.python.org/pipermail/web-sig/2008-July/003545.html" rel="nofollow noreferrer">"Could WSGI handle Asynchronous response?"</a>. In May 2008, there was a broad discussion in the Web-SIG about the topic of <a href="http://mail.python.org/pipermail/web-sig/2008-May/thread.html" rel="nofollow noreferrer">asynchronous requests in WSGI</a>.</p> <p>A recent development is <a href="http://code.google.com/p/evserver/" rel="nofollow noreferrer">evserver</a>, a lightweight WSGI server, which implements the <a href="http://mail.python.org/pipermail/web-sig/2008-May/003439.html" rel="nofollow noreferrer">Asynchronous WSGI extension</a> proposed by Christopher Stawarz in the Web-SIG in May 2008.</p> <p>Finally, the <a href="http://www.tornadoweb.org/" rel="nofollow noreferrer">Tornado web server</a> supports <a href="http://www.tornadoweb.org/documentation#non-blocking-asynchronous-requests" rel="nofollow noreferrer">non-blocking asynchronous requests</a>. It has a chat example application using long polling, which has similarities with your requirements.</p>

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