Nginx non-root url proxy_pass not working with Luigi

[Tashrif B.]

Hi all,

I am trying to reverse proxy the Luigi server through Nginx. The `proxy_pass` against root URL works but not for non-root URL.

I am working on a CentOS 7 Linux machine. I launched Luigi server as luigid --address 127.0.0.1 --port 8082. I edited the default `/etc/nginx/nginx.conf` file with the following:

```
location / {
     proxy_pass http://127.0.0.1:8082;
}
```
Then curl -L http://`hostname`/ prints the `/static/visualiser/index.html` content fine and I see the following Tornado log (Luigid log):
```
2020-08-11 INFO: 302 GET / (127.0.0.1) 0.47ms
2020-08-11 INFO: 200 GET /static/visualiser/index.html (127.0.0.1) 0.77ms
```

---

However, for the **non-root** URL configuration, I run into error 404--
```
location /luigi/ {
     proxy_pass http://127.0.0.1:8082/$1;
}
```
Output of curl -L http://`hostname`/luigi/ is about error 404.

Tornado log:
```
2020-08-11 INFO: 302 GET / (127.0.0.1) 0.47ms
(2nd line is missing)
```

Because of the missing second line, it looks like either Nginx or Tornado is not able to redirect the request properly. Can anyone please help?

Best,

Tashrif

[Tashrif B.]

I found a way that I wanted to share-- having the former configuration:

```vim

location / {
     proxy_pass http://127.0.0.1:8082;
}
```

But modifying `luigi/server.py` line 302 with `luigi/` prefix makes `curl -L http://hostname/luigi/` work:

```python
300     handlers = [
301         (r'/api/(.*)', RPCHandler, {"scheduler": scheduler}),
302         (r'/luigi/', RootPathHandler, {'scheduler': scheduler}),
303         (r'/tasklist', AllRunHandler, {'scheduler': scheduler}),
304         (r'/tasklist/(.*?)', SelectedRunHandler, {'scheduler': scheduler}),
305         (r'/history', RecentRunHandler, {'scheduler': scheduler}),
306         (r'/history/by_name/(.*?)', ByNameHandler, {'scheduler': scheduler}),
307         (r'/history/by_id/(.*?)', ByIdHandler, {'scheduler': scheduler}),
308         (r'/history/by_params/(.*?)', ByParamsHandler, {'scheduler': scheduler}),
309         (r'/metrics', MetricsHandler, {'scheduler': scheduler})
310     ]
```

I started my approach without Nginx-- I modified the `luigi/server.py` and tested just `curl -L http://127.0.0.1/luigi/` before trying the Nginx.

That being said, I am yet to find a way to solve this problem without modifying `luigi/server.py`

Thanks,

Tashrif