Nginx+gunicorn 404

supervisorctl says that gunicorn procces have a RUNNING state and I thought that it is success. But something is wrong yet. Resource available only by IP

Nginx config:

upstream hello_app_server {
  server unix:/var/www/aqe-backend/gunicorn.sock fail_timeout=0;
}

server {

    listen   80;
    server_name 188.166.200.51;

    client_max_body_size 4G;

    access_log /var/www/aqe-backend/logs/nginx-access.log;
    error_log /var/www/aqe-backend/logs/nginx-error.log;

    location /static/ {
        alias   /var/www/aqe-backend/static/;
    }

    location /media/ {
        alias   /var/www/aqe-backend/media/;
    }

    location / {
        # an HTTP header important enough to have its own Wikipedia entry:
        #   http://en.wikipedia.org/wiki/X-Forwarded-For
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        # enable this if and only if you use HTTPS, this helps Rack
        # set the proper protocol for doing redirects:
        # proxy_set_header X-Forwarded-Proto https;

        # pass the Host: header from the client right along so redirects
        # can be set properly within the Rack application
        proxy_set_header Host $http_host;

        # we don't want nginx trying to do something clever with
        # redirects, we set the Host: header above already.
        proxy_redirect off;

        # set "proxy_buffering off" *only* for Rainbows! when doing
        # Comet/long-poll stuff.  It's also safe to set if you're
        # using only serving fast clients with Unicorn + nginx.
        # Otherwise you _want_ nginx to buffer responses to slow
        # clients, really.
        # proxy_buffering off;

        # Try to serve static files from nginx, no point in making an
        # *application* server like Unicorn/Rainbows! serve static files.
        if (!-f $request_filename) {
            proxy_pass http://188.166.200.51;
            break;
        }
    }

    error_page 500 502 503 504 /500.html;
    location = /500.html {
        root /var/www/aqe-backend/static/;
    }
}

gunicorn script:

#!/bin/bash

NAME="aqe"                                  # Name of the application
DJANGODIR=/var/www/aqe-backend/             # Django project directory
SOCKFILE=/var/www/aqe-backend/gunicorn.sock  # we will communicte using this unix socket
USER=www-data                                        # the user to run as
GROUP=www-data                                     # the group to run as
NUM_WORKERS=3                                     # how many worker processes should Gunicorn spawn
DJANGO_SETTINGS_MODULE=project.settings_prod             # which settings file should Django use
DJANGO_WSGI_MODULE=project.wsgi                     # WSGI module name

echo "Starting $NAME as `whoami`"

# Activate the virtual environment
cd $DJANGODIR
source env/bin/activate
export DJANGO_SETTINGS_MODULE=$DJANGO_SETTINGS_MODULE
export PYTHONPATH=$DJANGODIR:$PYTHONPATH

# Create the run directory if it doesn't exist
RUNDIR=$(dirname $SOCKFILE)
test -d $RUNDIR || mkdir -p $RUNDIR

# Start your Django Unicorn
# Programs meant to be run under supervisor should not daemonize themselves (do not use --daemon)
exec gunicorn ${DJANGO_WSGI_MODULE}:application 
  --name $NAME 
  --workers $NUM_WORKERS 
  --user=$USER --group=$GROUP 
  --bind=unix:$SOCKFILE 
  --log-level=debug 
  --log-file=-