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Editorial Team
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Asked: 2026-05-14T06:55:19+00:00

Given, when a user requests /foo on my server, I send the following HTTP

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Given, when a user requests /foo on my server, I send the following HTTP response (not closing the connection):

Content-Type: multipart/x-mixed-replace; boundary=-----------------------

-----------------------
Content-Type: text/html

<a href="/bar">foo</a>

When the user goes to /bar (which will send 204 No Content so the view doesn’t change), I want to send the following data in the initial response.

-----------------------
Content-Type: text/html

bar

How would I get the second request to trigger this from the initial response? I’m planning on possibly creating a fancy [engines that support multipart/x-mixed-replace (currently only Gecko)]-only email webapp that does server-push and Ajax effects without any JavaScript, just for fun.

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1 Answer

  1. Editorial Team

    No complete answer, but:

    In your question, you’re describing a Comet-style architecture. Regarding support of Comet-style techniques in Python/WSGI, there is a StackOverflow question, which talks about various Python servers with support for long-running requests a la Comet.

    Also interesting is this mail thread in the Python Web-SIG: “Could WSGI handle Asynchronous response?”. In May 2008, there was a broad discussion in the Web-SIG about the topic of asynchronous requests in WSGI.

    A recent development is evserver, a lightweight WSGI server, which implements the Asynchronous WSGI extension proposed by Christopher Stawarz in the Web-SIG in May 2008.

    Finally, the Tornado web server supports non-blocking asynchronous requests. It has a chat example application using long polling, which has similarities with your requirements.

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