<VirtualHost *:80>
        ServerAdmin webmaster@localhost
        ServerName mattermost.MONDOMAINE.fr
        ServerAlias mattermost

        ProxyPreserveHost On
        ProxyRequests Off
        ProxyPass / http://127.0.0.1:8065/
        ProxyPassReverse / http://127.0.0.1:8065/

          RewriteEngine on
          RewriteCond %{REQUEST_URI} ^/api/v1/websocket [NC,OR]
          RewriteCond %{HTTP:UPGRADE} ^WebSocket$ [NC,OR]
          RewriteCond %{HTTP:CONNECTION} ^Upgrade$ [NC]
          RewriteRule .* ws://127.0.0.1:8065%{REQUEST_URI} [P,QSA,L]
          RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f
          RewriteRule .* http://127.0.0.1:8065%{REQUEST_URI} [P,QSA,L]

<Location /api/v1/websocket>
    Require all granted
    ProxyPassReverse http://127.0.0.1:8065
    ProxyPassReverseCookieDomain 127.0.0.1 mattermost.MONDOMAINE.fr
</Location>
<Location />
    Require all granted
    ProxyPassReverse http://127.0.0.1:8065
    ProxyPassReverseCookieDomain 127.0.0.1 mattermost MONDOMAINE.fr
</Location>

###############

        ErrorLog ${APACHE_LOG_DIR}/error_mattermost.log

        # Possible values include: debug, info, notice, warn, error, crit,
        # alert, emerg.
        LogLevel warn

        CustomLog ${APACHE_LOG_DIR}/access_mattermost.log combine
</VirtualHost>