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Editorial Team
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Asked: 2026-05-24T01:55:54+00:00

I’m building a web tool which allows users to upload PDFs to a server

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I’m building a web tool which allows users to upload PDFs to a server using their web browsers. The server is based on Python (Paste + Pyramid).

The problem I have right now is the following: If a user uploads a rather large file (let’s say 100 MB) and they cancel the upload before it is completed, my handler code on the server is still called (instead of the request being aborted).

The problem is that the request.POST['myfile'].file is incomplete when that happens. This effectively means that the PDF file is corrupted if I simply write it to some place on the server.

When I watch the server’s log, it shows a “broken pipe” exception within the Paste server; however I have no idea how to catch that exception and have it prevent my view/handler code from executing and storing the incomplete file.

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1 Answer

  1. Editorial Team

    Seems like the paster HTTP server does not correctly validate the uploaded form data and simply passes the request down the WSGI pipeline even if the connection (HTTP POST) was closed by the user.

    I worked around this issue by simply setting up NGINX to act as a reverse proxy. This also adds some security benefits as it might be better tested than paster.

    Update:

    My main problem was that I was using runserver (the built in web server of manage.py). After some trial and error we ended up using WSGI.

    More specifically, uWSGI and Nginx as web server. Static content is served directly by Nginx while dynamic pages are piped through uWSGI and are handled by the Python web app.

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