Nginx connection reset, response from uWsgi lost

Question

I have a django app hosted via Nginx and uWsgi. In a certain very simple request, I get different behaviour for GET and POST, which should not be the case.

The uWsgi daemon log:

[pid: 32454|app: 0|req: 5/17] 127.0.0.1 () {36 vars in 636 bytes} [Tue Oct 19 11:18:36 2010] POST /buy/76d4f520ae82e1dfd35564aed64a885b/a_2/10/ => generated 80 bytes in 3 msecs (HTTP/1.0 440) 1 headers in 76 bytes (0 async switches on async core 0) [pid: 32455|app: 0|req: 5/18] 127.0.0.1 () {32 vars in 521 bytes} [Tue Oct 19 11:18:50 2010] GET /buy/76d4f520ae82e1dfd35564aed64a885b/a_2/10/ => generated 80 bytes in 3 msecs (HTTP/1.0 440) 1 headers in 76 bytes (0 async switches on async core 0) 

The Nginx accesslog:

127.0.0.1 - - [19/Oct/2010:18:18:36 +0200] "POST /buy/76d4f520ae82e1dfd35564aed64a885b/a_2/10/ HTTP/1.0" 440 0 "-" "curl/7.19.5 (i486-pc-linux-gnu) libcurl/7.19.5 OpenSSL/0.9.8g zlib/1.2.3.3 libidn/1.15" 127.0.0.1 - - [19/Oct/2010:18:18:50 +0200] "GET /buy/76d4f520ae82e1dfd35564aed64a885b/a_2/10/ HTTP/1.0" 440 80 "-" "curl/7.19.5 (i486-pc-linux-gnu) libcurl/7.19.5 OpenSSL/0.9.8g zlib/1.2.3.3 libidn/1.15" 

The Nginx errorlog:

2010/10/19 18:18:36 [error] 4615#0: *5 readv() failed (104: Connection reset by peer) while reading upstream, client: 127.0.0.1, server: localhost, request: "POST /buy/76d4f520ae82e1dfd35564aed64a885b/a_2/10/ HTTP/1.0", upstream: "uwsgi://unix:sock/uwsgi.sock:", host: "localhost:9201" 

In essence, Nginx somewhere loses the response if I use POST, not so if I use GET.

Anybody knows something about that?

Answer 1

Pass --post-buffering 1 to uwsgi

This will automatically buffer all the http body > 1 byte

The problem is raised by the way nginx manages upstream disconnections

Answer 2

I hit the same issue, but on my case I can't disable "uwsgi_pass_request_body" as most times (but not always) my app do need the POST data.

This is the workaround I found, while this issue is not fixed in uwsgi: http://permalink.gmane.org/gmane.comp.python.wsgi.uwsgi.general/813

import django.core.handlers.wsgi class ForcePostHandler(django.core.handlers.wsgi.WSGIHandler):     """Workaround for: http://lists.unbit.it/pipermail/uwsgi/2011-February/001395.html     """     def get_response(self, request):         request.POST # force reading of POST data         return super(ForcePostHandler, self).get_response(request)  application = ForcePostHandler()