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copied!<p>I can't tell you exactly what causes your problem - it could be caused by buffering problems in StringIO. </p> <p>However, you are wrong if you assume that this code would actually stream the generated PDF data: StringIO.getvalue() returns the content of the string buffer at the time this method is called, not an output stream (see <a href="http://docs.python.org/library/stringio.html#StringIO.StringIO.getvalue" rel="nofollow noreferrer">http://docs.python.org/library/stringio.html#StringIO.StringIO.getvalue</a>).</p> <p>If you want to stream the output, you can treat the HttpResponse instance as a file-like object (see <a href="http://docs.djangoproject.com/en/1.2/ref/request-response/#usage" rel="nofollow noreferrer">http://docs.djangoproject.com/en/1.2/ref/request-response/#usage</a>).</p> <p>Secondly, I don't see any reason to make use of StringIO here. According to the documentation of Pisa I found (which calls this function CreatePDF, by the way) the source can be a string or a unicode object.</p> <p>Personally, I would try the following:</p> <ol> <li>Create the HTML as unicode string</li> <li>Create and configure the HttpResponse object</li> <li>Call the PDF generator with the string as input and the response as output</li> </ol> <p>In outline, this could look like this:</p> <pre><code>html = template.render(context) response = HttpResponse() response['Content-Type'] ='application/pdf' response['Content-Disposition']='attachment; filename=%s.pdf'%(filename) pisa.CreatePDF( src=html, dest=response, show_error_as_pdf=True) #response.flush() return response </code></pre> <p>However, I did <strong>not</strong> try if this actually works. (I did this sort of PDF streaming only in Java, so far.)</p> <p><strong>Update:</strong> I just looked at the implementation of HttpResponse. It implements the file interface by collecting the chunks of strings written to it in a list. Calling response.flush() is pointless, because it does nothing. Also, you can set response parameters like Content-Type even after the response has been accessed as file-object.</p> <p>Your original problem may also be related to the fact you never closed the StringIO objects. The underlying buffer of a StringIO object is not released before close() is called.</p>

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