Reverse proxy for nginx configuration for subpath

Question

I currently have this configuration for a reverse proxy in nginx

 server { listen 8888 default_server; root /usr/share/nginx/html; index index.html index.htm; location / { try_files $uri @proxy; } location = / { try_files $uri @proxy2; } location = /redirect.html { try_files $uri @proxy2; } location ~ /user/(.*)$ { try_files index.html @proxy2; } location @proxy2 { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $remote_addr; proxy_set_header Host $host; proxy_pass http://127.0.0.1:6079; max_ranges 0; } location @proxy { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $remote_addr; proxy_set_header Host $host; proxy_pass http://127.0.0.1:6081; max_ranges 0; } location = /websockify { proxy_http_version 1.1; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection "upgrade"; proxy_pass http://127.0.0.1:6081; } } 

My problem is that I have a url of the type http://example.com:8888/user/username and I need to redirect it to localhost:6079. Unfortunately, what is listening on port 6079 wants the URL without the /user/username part. It is my understanding that when I try to use this configuration, I get a flask generated 404 (the application at port 6079 is a flask app). I tried pretty much everything for the whole afternoon, including rewrite of the url, hardcoding the actual url and other tricks from the documentation of nginx, but I could not find a working solution.

Observe that if I connect directly to http://localhost:6079/ the application works fine, so it really seems to be this nginx setup.

Edit:

I tried to modify as suggested and add the / at the proxy2 proxy_pass line, but it complains as explained here

https://stackoverflow.com/questions/21662940/proxy-pass-cannot-have-uri-part-in-location/21714937#21714937

As for the logs, I don't see anything unexpected, except that if I connect to localhost:8888/user/username it shows a 404, and if I connect to localhost:8888 I see the flask app.

Keep into account that the nginx is on a docker image, but I browse from the host machine, so 127.0.0.1 in the nginx is the docker instance, and when I browse 127.0.0.1 it's the host machine and the port goes through the bridge that I setup when I started the container.

Edit 2

Logs don't tell much.

172.17.42.1 - - [10/May/2016:22:14:05 +0000] "GET /user/sborini/redirect.html?width=1375&height=695 HTTP/1.1" 200 212 "http://localhost:8888/user/sborini/" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0" 172.17.42.1 - - [10/May/2016:22:14:05 +0000] "GET /user/sborini/vnc_auto.html HTTP/1.1" 404 166 "http://localhost:8888/user/sborini/redirect.html?width=1375&height=695" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0" 172.17.42.1 - - [10/May/2016:22:14:57 +0000] "GET /user/sborini/vnc_auto.html HTTP/1.1" 404 209 "http://localhost:8888/user/sborini/redirect.html?width=1375&height=695" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0" 172.17.42.1 - - [10/May/2016:22:14:58 +0000] "GET /user/sborini/vnc_auto.html HTTP/1.1" 404 209 "http://localhost:8888/user/sborini/redirect.html?width=1375&height=695" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0" 172.17.42.1 - - [10/May/2016:22:18:59 +0000] "GET / HTTP/1.1" 200 454 "-" "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0" 

See how I get something if I connect to the plain / entry In any case, I tried a simplified case:

server { listen 8888 default_server; root /usr/share/nginx/html; index index.html index.htm; location = /user/sborini/ { proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $remote_addr; proxy_set_header Host $host; proxy_pass http://127.0.0.1:5555; max_ranges 0; } } 

and a netcat listening on 5555. I get a bad gateway. Investigating.

Answer 1

Add a trailing slash to your proxy_pass directive.

proxy_pass http://127.0.0.1:6079/; 

Source

Documentation

Fingers crossed this works... took me 30 seconds on Google to work it out.