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https://stackoverflow.com/questions/5011102/apache-reverse-proxy-with-basic-authentication
https://github.com/pliablepixels/zmNinja/wiki/Apache-Proxy-Authorization-with-HTTPS,-Basic-Auth,-and-ProxyPass
https://httpd.apache.org/docs/2.4/howto/reverse_proxy.html
https://community.spiceworks.com/topic/2160061-apache-reverse-proxy-form-authentication
https://serverfault.com/questions/153229/password-protect-and-serve-apache-site-by-port-number/153413
https://community.grafana.com/t/grafana-with-apache-reverse-proxy-shows-2-login-pages/6507
https://www.digitalocean.com/community/tutorials/how-to-use-apache-http-server-as-reverse-proxy-using-mod_proxy-extension
https://www.digitalocean.com/community/tutorials/how-to-use-apache-as-a-reverse-proxy-with-mod_proxy-on-ubuntu-16-04
https://docs.docker.com/registry/recipes/apache/
https://doc.nuxeo.com/nxdoc/http-and-https-reverse-proxy-configuration/
https://wiki.jenkins.io/display/JENKINS/Running+Jenkins+behind+Apache
http://www.cafesoft.com/products/cams/wa/apache2/docs32/linux/prefork/x86/64bit/ApacheReverseProxy.html
https://galaxyproject.org/admin/config/apache-external-user-auth/