MailHog not working when using nginx proxy pass

[prazmok]

I am using MailHog as a Docker container (using docker-compose) and for default configuration everything is OK. Unfortunately when I created Nginx proxy pass I get an error in browser console

VM61:35 WebSocket connection to 'ws://mailhog.sf3.dev:81/api/v2/websocket' failed: Error during WebSocket handshake: Unexpected response code: 400

I guess it is bad configuration problem but as far as I know there is no option to configure MailHog image for docker-compose.

[blueimp]

@prazmok
You can use mailhog in a docker-compose setup with nginx as proxy.
Here's a guide from the nginx homepage that will help you to set it up:
https://www.nginx.com/blog/websocket-nginx/

[JSchlarb]

@prazmok Add this to your nginx config ... That should do the trick. You must ensure that your mime.types are well configured

        chunked_transfer_encoding on;
        proxy_set_header X-NginX-Proxy true;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_http_version 1.1;
        proxy_redirect off;
        proxy_buffering off;

More https://www.nginx.com/blog/websocket-nginx/

[ian-kent]

I've added a note to the configuration section of the docs - it's probably not in the most obvious place, but hopefully it'll help someone out!

[mkrsn]

Here is the equivalent config for the Apache

<LocationMatch /api/v2/websocket>
    ProxyPass ws://127.0.0.1:3001/api/v2/websocket
</LocationMatch>

[opi]

Related comment about Apache proxy configuration #142 (comment)

[rounak-codiant]

Below block worked for me

location ^~ /mailhog/ {
       chunked_transfer_encoding on;
       proxy_set_header X-NginX-Proxy true;
       proxy_pass http://localhost:8025/;        
       proxy_set_header Upgrade $http_upgrade;
       proxy_set_header Connection "upgrade";
       proxy_http_version 1.1;
       proxy_redirect off;
       proxy_buffering off;
 }

[renanlucas07]

Below block worked for me

location ^~ /mailhog/ {
       chunked_transfer_encoding on;
       proxy_set_header X-NginX-Proxy true;
       proxy_pass http://localhost:8025/;        
       proxy_set_header Upgrade $http_upgrade;
       proxy_set_header Connection "upgrade";
       proxy_http_version 1.1;
       proxy_redirect off;
       proxy_buffering off;
 }

I used this inside a new server block together with my rails app configuration, i've added its own server_name and only / instead of /mailhog/ as the location