I have an url like this: "mydomain.com/dictionary/Elastizit%E4t.htm".

I know the url sucks, I'm migrating a very old site and for SEO reasons we need to make redirects from the old urls to the new ones. So for the time being I have something like 14000 URLs like this and I need to redirect them to their new companions or follow some redirect rules defined in my django/python webserver.

If the URL would hit my python app, I'd be able to handle it like this:

>>> from urllib.parse import unquote
>>> unquote('Elastizit%E4t.htm', encoding='latin')

However, nginx itself breaks with a 400 Bad Request.

My Nginx config is very simple:

server {
    listen 80;
    server_name mydomain.com;
    client_max_body_size 10M;

    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
        root /srv/mydomain.com/shared/public;

    location / {
        auth_basic "Restricted";
        auth_basic_user_file /etc/nginx/.htpasswd;

        include proxy_params;
        proxy_pass http://unix:/srv/mydomain.com/current/gunicorn.sock;

It's important to me, that the webserver itself utf-8, I don't want to have iso-8859-1 and friends as my default encoding.

  • What do your nginx debug logs say? – womble Oct 28 '15 at 9:32
  • Interestingly, the debugging log contains the correct encoding ... dpaste.de/OomL – shredding Oct 28 '15 at 10:50
  • 1
    recv() not ready (11: Resource temporarily unavailable) while nginx is trying to talk to gunicorn... This has nothing to do with character encoding. – Michael Hampton Oct 28 '15 at 12:30
  • Hm, I'm not sure if that really belonged together. If I now do it again, the debug log does not fill at all. – shredding Oct 28 '15 at 13:05
  • oh, it belongs together, sorry. there is a debug log. However, my webapp has a 400 Page that isn't shown. Therefore it should happen in gunicorn, which in turn has nothing in it's logs. – shredding Oct 28 '15 at 13:06

It turned out to be a bug in most python frameworks, aka https://code.djangoproject.com/ticket/25623 and https://github.com/Pylons/pyramid/issues/2047.

Your Answer

By clicking "Post Your Answer", you agree to our terms of service, privacy policy and cookie policy

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