Websocket error

Hello. I am using the web app from remote location and I am taking websocket errors. Also everything is with some seconds delay.
As I ubderstood it is browser issue. Only in firefox is working some times.
Any way to fix this?

What makes you think it's a browser issue? It's usually a network problem.

I thought it is browser issue because of the new security updates for Cross-origin resource sharing . Also in firefox it is working. What do you believe problem is?

Just check the error in the browser developer tools instead of guessing.

This is the error I am getting in console

WebSocketService.js:68 WebSocket connection to 'wss://domain/api/socket' failed: Error during WebSocket handshake: Unexpected response code: 503
(anonymous) @ WebSocketService.js:68
c @ runtime.js:63
(anonymous) @ runtime.js:293
(anonymous) @ runtime.js:118
i @ asyncToGenerator.js:3
s @ asyncToGenerator.js:25
(anonymous) @ asyncToGenerator.js:32
(anonymous) @ asyncToGenerator.js:21
(anonymous) @ WebSocketService.js:14
(anonymous) @ WebSocketService.js:185
c @ runtime.js:63
(anonymous) @ runtime.js:293
(anonymous) @ runtime.js:118
i @ asyncToGenerator.js:3
s @ asyncToGenerator.js:25

Looks like you have HTTPS configured that you haven't mentioned before. Are you sure you configured proxy correctly? Have you tried without it?

Yes proxy is configured. remote location is also HTTPS . It is making the same even with http.

Let's see the proxy config.

This is the config

<IfModule mod_ssl.c>
        <VirtualHost _default_:443>

                ServerName mydomain.com
                ServerAdmin webmaster@localhost

                DocumentRoot /var/www/html

                ProxyPass /api/socket ws://localhost:8080/api/socket
                ProxyPassReverse /api/socket ws://localhost:8080/api/socket

                ProxyPass / http://localhost:8080/
                ProxyPassReverse / http://localhost:8080/

                SSLEngine on

                SSLCertificateFile /etc/letsencrypt/live/mydomain.com/fullchain.pem
                SSLCertificateKeyFile /etc/letsencrypt/live/mydomain.com/privkey.pem
Include /etc/letsencrypt/options-ssl-apache.conf
        </VirtualHost>

<VirtualHost *:80>
  ServerName mydomain.com
  Redirect / https://mydomain.com
</VirtualHost>



</IfModule>

Which Apache modules do you have enabled? Specifically proxy_wstunnel has to be enabled.

ssl,
proxy_http,
and proxy_wstunnel
The https is working ok locally. If I access the domain I have no errors. The problem is when the web app is on remote server.

OK, I don't have any other ideas.