So, I have a rather nasty problem with uploading files to Pylons, and I hope someone can help me. I originally posted the problem here , thinking it was a problem with Pylons, but since then I have come to the conclusion that the problem is with the server, that is, with the paste and I tracked exactly where the problem is happening, but I'm not sure how to solve it . The behavior is as follows. I have a Pylons web application that I serve through a paster. One part of the application allows users to upload files to systems, and sometimes they can be quite large (> 50 MB). During such downloads, the server periodically resets the connection (i.e., in Chrome, the error reads "Error 101 (net :: ERR_CONNECTION_RESET): the connection was reset.".) This does not always happen, only about 50% of the time with large files.
In these cases, the server never passes POST to the application level. An exception is not thrown (at least I can find). I narrowed the problem down to cascade.py (specifically the wsgi_application method called with httpserver.py). From the last:
result = self.server.wsgi_application (self.wsgi_environ, self.wsgi_start_response)
In a function call to the cascade.py function, the file appears to be written to a temporary file. The corresponding cycle begins with:
while copy_len> 0:
He then writes the fragments one by one to an open file. None of these entries raise a separate exception. However, the server will often just “leave” during these records, seemingly at random (time does not seem to correlate with this). Therefore, if I print a copy_len size that decreases, I watch it decrease to one point, and then the server unexpectedly sends a “reset connection” (or at least the client thinks it does) and the method seems to be completed (copy_len stops printing as if the cycle was completed, although it was not 0).
I am completely at a dead end, as 1) it only happens sporadically, and 2) I cannot track the actual error / exception - it just ... dies.
If that matters, I run pastes 1.7.3, Python 2.7, and Fedora OS. Can anyone understand what might happen, and how can I solve this? Thank you so much for any help.