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https://httpd.apache.org/docs/2.4/mod/mod_proxy.html
https://www.digitalocean.com/community/tutorials/how-to-use-apache-as-a-reverse-proxy-with-mod_proxy-on-ubuntu-16-04
https://stackoverflow.com/questions/5011102/apache-reverse-proxy-with-basic-authentication
https://superuser.com/questions/704781/apache-mod-proxy-with-automatic-authentication
https://github.com/pliablepixels/zmNinja/wiki/Apache-Proxy-Authorization-with-HTTPS,-Basic-Auth,-and-ProxyPass
https://serverfault.com/questions/457790/apache-mod-auth-and-mod-proxy-not-working-together
https://www.netnea.com/cms/apache-tutorial-9-reverse-proxy-einrichten/
http://www.psydoc-france.fr/manual/en/mod/mod_proxy.html
https://oncletom.io/2016/http-reverse-proxy/
https://www.msxfaq.de/internet/apache.htm
http://publib.boulder.ibm.com/httpserv/manual60/mod/mod_proxy.html
https://confluence.atlassian.com/doc/using-apache-with-mod_proxy-173669.html
https://community.grafana.com/t/proxy-auth-with-mod-cas-and-mod-proxy-no-login-solved/344