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<VirtualHost *:80>
        ServerName mattermost.example.org
        ServerAdmin webmaster@example.org

        ErrorLog ${APACHE_LOG_DIR}/mattermost-error.log
        CustomLog ${APACHE_LOG_DIR}/mattermost-access.log combined

        # Enforce HTTPS:
        RewriteEngine On
        RewriteCond %{HTTPS} !=on
        RewriteRule ^/?(.*) https://%{SERVER_NAME}/$1 [R,L]
</VirtualHost>

<VirtualHost *:443>
        SSLEngine on
        ServerName mattermost.example.org
        ServerAdmin webmaster@example.org

        ErrorLog ${APACHE_LOG_DIR}/mattermost-error.log
        CustomLog ${APACHE_LOG_DIR}mattermost-access.log combined

        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]
        RequestHeader set X-Forwarded-Proto "https"
        
        RequestHeader unset If-Modified-Since
        RequestHeader unset If-None-Match

        <LocationMatch "/api/(?<version>v[0-9]+)/(?<users>users/)?websocket$">
                Require all granted
                ProxyPassReverse ws://127.0.0.1:8065/api/%{env:MATCH_VERSION}/%{env:MATCH_USERS}websocket
                ProxyPassReverseCookieDomain 127.0.0.1 mattermost.example.org
        </LocationMatch>
        <Location />
                Require all granted
                ProxyPassReverse http://127.0.0.1:8065/
                ProxyPassReverseCookieDomain 127.0.0.1 mattermost.example.org
        </Location>
        
        ProxyPreserveHost On
        ProxyRequests Off
</VirtualHost>