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copied!<p>Don't send the content length and send the output as you derive it. You don't need to know the size of the output if you simply don't send the Content-Length header. That way can send part of the response before you have computed the rest of it.</p> <pre><code>def application(environ, start_response): status = '200 OK' output = 'Hello World!' response_headers = [('Content-type', 'text/html')] start_response(status, response_headers) yield head() yield part1() yield part2() yield part3() yield "" </code></pre> <p>Otherwise you will get no benefit from sending in chunks, since computing the output is probably the slow part and the internet protocol will send the output in chunks anyway.</p> <p>Sadly, this doesn't work in the case where, for example, the calculation of part2() decides you really need to change a header (like a cookie) or need to build other page-global data structures -- if this ever happens, you need to compute the entire output before sending the headers, and might as well use a <code>return [output]</code></p> <p>For example <a href="http://aaron.oirt.rutgers.edu/myapp/docs/W1200_1200.config_template" rel="nofollow noreferrer"> <a href="http://aaron.oirt.rutgers.edu/myapp/docs/W1200_1200.config_template" rel="nofollow noreferrer">http://aaron.oirt.rutgers.edu/myapp/docs/W1200_1200.config_template</a></a> Needs to build a page global data structure for the links to subsections that show at the top of the page -- so the last subsection must be rendered before the first chunk of output is delivered to the client.</p>

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