ActionCable WebSocket with Apache2 proxy

ws-with-apache2-proxy.conf

<VirtualHost *:80 *:443>
  # Domain
  ServerName servername.domain

  SSLEngine On
  SSLProxyEngine On
  # Path to SSL CRT file
  SSLCertificateFile /etc/apache2/ssl/apache.crt
  # Path to SSL KEY file
  SSLCertificateKeyFile /etc/apache2/ssl/apache.key

  ProxyRequests Off
  ProxyPreserveHost On

  <Location />
    ProxyPass http://0.0.0.0:3000/
    ProxyPassReverse http://0.0.0.0:3000/
  </Location>
  <Location /cable>
    ProxyPass ws://0.0.0.0:3000/cable
    ProxyPassReverse ws://0.0.0.0:3000/cale
  </Location>
</VirtualHost>

@ForeverYoung This code solved for me.

<VirtualHost *:80  *:443>
  ServerName api.mysite.com.br
  ServerAlias app.mysite.com.br

  DocumentRoot "/webapp/mysite/public"

  #SSLEngine On
  #SSLProxyEngine On

  ProxyRequests Off
  ProxyPreserveHost on

  <Location />
    ProxyPass http://0.0.0.0:3000/
    ProxyPassReverse http://0.0.0.0:3000/
  </Location>
 
 # ----------------------------------------
 # difference
 # host.com.br instead of 0.0.0.0:3000
  <Location /cable>
    ProxyPass ws://mysite.com.br:3000/cable
    ProxyPassReverse ws://mysite.com.br:3000/cable
  </Location>
 # ----------------------------------------

  <Proxy *>
    Order deny,allow
    Allow from all
  </Proxy>

  <Directory "/webapp/mysite/public">
        Options FollowSymlinks Multiviews
        AllowOverride All
        Allow from all
        Require all granted
        RailsEnv production
  </Directory>

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

https://gist.github.com/Thadeu/a29aa8413385aa82fa7007ff51ca8296