So I had my last "reverse proxy" problem fixed regarding "mapping" a port to a subfolder Thanks again to this awesome community.

I have been able to work with this solution for a while but now I am facing a new problem. The situation is:

There is a webpage setup (using nginx) with this url http://test.domain.com:8042/view.html. I needed for various reasons that this port turns into a subfolder and achieved it (with help) and gained http://test.domain.com/view/view.html.

The proxy_pass for this is:

location ~/view(.*)$ {
proxy_set_header X-Real-IP  $remote_addr;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header Host $host:$server_port;
proxy_pass http://test.domain.com:8042$1;

This works amazing. I can access the page over http://test.domain.com/view/view.html. There are several websockets on that page, one also has the port 8042. This one works fine. However, the other websockets have different ports, e.g. 8159. I have added an respective proxy_pass to the nginx config:

location ~/cantrace(.*)$ {
proxy_set_header X-Real-IP  $remote_addr;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header Host $host:$server_port;
proxy_pass http://test.domain.com:8159$1;

From Javascript this websocket is called via

my_websocket = new WebSocket('ws://test.domain.com/cantrace/ws');

but that does not work. Neither does

my_websocket = new WebSocket('ws://test.domain.com/view/cantrace/ws');

What does work, however, is


and then it loads the other websockets on view.html with

my_websocket = new WebSocket('ws://test.domain.com/cantrace/ws');

which did previously not work.

So clearly the double proxy_pass with /view and /cantrace is a problem here. Is there a way to work around this with nginx?

Thank you very much!


1 Answer 1


I had such a setup to access two servers behind a reverse proxy, I believe your proxy_passs directive is missing a trailing /, this was my setup:

       location /server1 {
               proxy_pass http://server1:8081/;
               proxy_buffering off;
       location /server2 {
               proxy_pass http://server2:8082/;
               proxy_buffering off;

In your case, this would translate to:

proxy_pass http://test.domain.com:8042/$1;
  • Hi, thank you for your help. Unfortunately that did not really work although I believe it should have. However, this would resolve to test.domain.com:8042/cantrace but I also want to get rid of the first port number. I am starting to believe nginx can't do that and I should fall back to solutions outside of nginx.
    – pAt84
    Aug 7, 2016 at 13:23

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.