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Mike Looijmans
nlv11281 at natlab.research.philips.com
Mon Feb 20 10:11:26 EST 2006
There are still some problems with the FieldStorage class and large files. If you want to upload a large file, you MUST use a make_file callback to the FieldStorage constructor and NEVER call form["file"] for that field or your apache process will load the whole file into RAM. In other words: - Does it work with small (e.g. 10k) files? - Look at apache's memory usage. -- Mike Looijmans Philips Natlab / Topic Automation Daniel Nogradi wrote: > I try to figure out exactly how an actual request gets converted into > an mp_request object, especially if its content-type is > multpart/form-data containing an uploaded file. > > As a first step (with the zeroth step being reading the source of > publisher.py and util.py) I wanted to see what happens if the > minimalistic handler mentioned in the docs receives a POST requests > sent from a file upload form such as > > <html><body> > <form enctype="multipart/form-data" method="post" > action="http://server/testhandler/x"> > <input type="file" name="upload_this"> > <input type="submit" name="go" value="Click this"> > </form> > </body></html> > > and apache is given the following: > > <Directory /var/www/html/testhandler> > SetHandler python-program > PythonHandler mod_python.myhandler > LimitRequestBody 0 > </Directory> > > and the request handler myhandler.py is: > > from mod_python import apache > > def handler( req ): > req.content_type = "text/html" > req.write( "hello" ) > return apache.OK > > I would assume that no matter what kind of request comes in to the > hierarchy under /testhandler the response from the server should be > 'hello' under all circumstances. With GET requests everything is okay, > the response is > > HTTP/1.1 200 OK > Date: Sun, 19 Feb 2006 17:11:54 GMT > Server: Apache/2.0.53 (Fedora) > Connection: close > Transfer-Encoding: chunked > Content-Type: text/html; charset=UTF-8 > > 5 > hello > 0 > > which gets displayed nicely by Firefox as 'hello'. > > The trouble starts when POST request are coming in for example through > the html form above. After sending the form Firefox says 'The document > contains no data' in a warning window (actually it displays 'hello' > once or twice, but 99% of the time it just shows the warning). However > after checking the log files of apache it turns out that everything > went okay with the request, a 200 code was sent and the length of the > response is also correctly shown to be 5. So it seems that from the > point of view of the server everything went fine, but somehow Firefox > never gets (or it thinks it doesn't get) the 200 code and the response > containing 'hello'. > > In order to see if it was really a Firefox issue I put together the > POST request by hand and sent it to the server with netcat and > everything went as expected, the output was the same as above. > > So it seems it is a Firefox issue, but I'm a bit surprised that such a > simple example would not work with Firefox. Am I expecting something > that I shouldn't? > > _______________________________________________ > Mod_python mailing list > Mod_python at modpython.org > http://mailman.modpython.org/mailman/listinfo/mod_python
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