Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have a Django site which I am trying to server via uWSGI. I have started the server like so:

uwsgi --emperor .
bg 1

(There are two .ini files which point to the test version and production version of the site, serving on 9001 and 9002 respectively)

I then attempt to get my site:

curl http://localhost:9002

When I do that, I get a message saying the the vassel is loyal but no actual response. The uwsgi.log then contains the following:

[pid: 5071|app: 0|req: 2/2] () {26 vars in 357 bytes} [Tue Jul 23 13:20:21 2013] GET / => generated 0 bytes in 1 msecs (HTTP/1.1 302) 2 headers in 96 bytes (1 switches on core 1)

No errors are logged.

I should say, this worked fine prior to a reboot so the uwsgi.ini files should be fine.

Any ideas where I should start diagnosing this?

share|improve this question
I can report a similar issue but with an even more basic configuration. Headers are sent properly, but the response body is simply empty. I experience this with Python 3.4 both uWSGI and gunicorn. – Dakota Mar 29 '14 at 19:22
tail the uwsgi log and read it very carefully, its a verbose annoyance but I was able to eventually track down my issue, I was missing the plugin = python3 stanza from my uwsgi vassal's ini, Which in turn meant my python3 django project wasn't actually being loaded or run correctly, – ThorSummoner Oct 3 '15 at 8:26

I had the some problem, it turned out that my wsgi application was returning UNICODE instead of BYTE STRINGS (I was on python3) ; and nothing showed in logs about it... WSGI expects byte strings in output, never unicode.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.