#29800: Django hangs when Content-Length has incorrect value
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Reporter: Alexander Charykov | Owner: Patrik
| Sletmo
Type: Bug | Status: assigned
Component: HTTP handling | Version: 2.1
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Patrik Sletmo):
I skimmed through the WSGI specification and it contains a description on
how to handle Content-Length headers shorter than the payload, but as
Claude Paroz guessed it does not give any instructions for handling the
opposite case.
As the recommended way of running Django in production is behind a reverse
proxy I don't think that there should be any fix implemented that attempts
to mitigate the effect of a Slowloris attack. I do however think that from
a usability standpoint it could make sense not to hang the entire
application in case the request given above is received.
Would there be any practical implications that could motivate against
using a timeout period for receiving the data? If nginx is used as a
reverse proxy with the default option proxy_request_buffering set, the
timeout would limit the time required for transmitting the request from
the reverese proxy to Django, and this really shouldn't take any
substantial amount of time. I suppose that implementing a timeout option
in Django in some situations could create the need to configure a timeout
in both the reverse proxy and in Django, but I think that these cases are
rather slim.
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Ticket URL: <https://code.djangoproject.com/ticket/29800#comment:6>
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