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13

I found the fix for me.

Since my docker-instance is running on plain http and running on port 80(within the docker container) and the reverse-proxy is handling the SSL, I had to specify the following 2 config options for the reverse proxy:

  RequestHeader set X-Forwarded-Proto "https"
  RequestHeader set X-Forwarded-Port "443"

The full apache2 virtual host section is:

<VirtualHost *:443>

        ServerName server.domain.tld

        SSLCertificateFile      /etc/letsencrypt/live/server.domain.tld/cert.pem
        SSLCertificateKeyFile   /etc/letsencrypt/live/server.domain.tld/privkey.pem
        SSLCertificateChainFile /etc/letsencrypt/live/server.domain.tld/chain.pem

        ErrorLog ${APACHE_LOG_DIR}/onlyoffice_error.log
        CustomLog ${APACHE_LOG_DIR}/onlyoffice_access.log combined

        ServerAdmin webmaster@localhost
        DocumentRoot /var/www/empty

        <Location />
                RequestHeader set X-Forwarded-Proto "https"
                RequestHeader set X-Forwarded-Port "443"
                ProxyPass http://localhost:10080/
                ProxyPassReverse http://localhost:10080
        </Location>
</VirtualHost>
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