I made a restart of the webservice (`webservice restart` ; since then also did a `stop` / `start`).
The tool now returns
```
504 Gateway Time-out
nginx/1.13.6
```
The UWSGI logs do not report anything:
```
*** Starting uWSGI 2.0.7-debian (64bit) on [Wed Mar 27 12:39:42 2019] ***
compiled with version: 4.9.2 on 17 March 2018 15:40:38
os: Linux-4.9.0-0.bpo.6-amd64 #1 SMP Debian 4.9.88-1+deb9u1~bpo8+1 (2018-05-13)
nodename: wikiloves-1326522376-rywwi
machine: x86_64
clock source: unix
pcre jit disabled
detected number of CPU cores: 4
current working directory: /data/project/wikiloves
detected binary path: /usr/bin/uwsgi-core
your memory page size is 4096 bytes
detected max file descriptor number: 65536
lock engine: pthread robust mutexes
thunder lock: disabled (you can enable it with --thunder-lock)
uwsgi socket 0 bound to TCP address :8000 fd 3
Python version: 2.7.9 (default, Sep 25 2018, 20:46:16) [GCC 4.9.2]
Set PythonHome to /data/project/wikiloves/www/python/venv
*** Python threads support is disabled. You can enable it with --enable-threads ***
Python main interpreter initialized at 0x21363b0
your server socket listen backlog is limited to 100 connections
your mercy for graceful operations on workers is 60 seconds
mapped 363840 bytes (355 KB) for 4 cores
*** Operational MODE: preforking ***
mounting /data/project/wikiloves/www/python/src/app.py on /wikiloves
WSGI app 0 (mountpoint='/wikiloves') ready in 16 seconds on interpreter 0x21363b0 pid: 1 (default app)
*** uWSGI is running in multiple interpreter mode ***
spawned uWSGI master process (pid: 1)
spawned uWSGI worker 1 (pid: 9, cores: 1)
spawned uWSGI worker 2 (pid: 10, cores: 1)
spawned uWSGI worker 3 (pid: 11, cores: 1)
spawned uWSGI worker 4 (pid: 12, cores: 1)
```