#8622: Exceptions in UploadHandler cause hang
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Reporter: kmtracey | Owner: nobody
Status: new | Milestone: 1.0
Component: File uploads/storage | Version: SVN
Resolution: | Keywords:
Stage: Unreviewed | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Comment (by vung):
`request.POST` is computed the first time it is accessed and cached in
`request._post`; if `request._post` is missing, the `request.POST`
accessor starts parsing POST data.
Parsing POST data means that a django.http.!MultiPartParser is
instantiated and starts reading from the socket.
If an exception is raised in the meantime, `request._post` is not set and
any access to request.POST will trigger again the parsing.
This second parsing happens when the exception is handled, in
django.core.handlers.base.!BaseHandler.handle_uncaught_exception, which
calls repr(request), etc.
A second !MultiPartParser is instantiated and since the first parser
already consumed some bytes this second one will never get the chance to
read up to content_length, so it will block waiting for content -- the
exact place is django.http.!LimitBytes.read()
I made a small test which reproduces the problem (no solution, though)
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Ticket URL: <http://code.djangoproject.com/ticket/8622#comment:5>
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