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https://stackoverflow.com/questions/20406845/proxy-error-502-the-proxy-server-received-an-invalid-response-from-an-upstream
https://userforum.onleihe.de/forum/index.php?thread/12074-hilfe-seite-down/
https://community.sophos.com/products/unified-threat-management/f/german-forum/63097/the-proxy-server-could-not-handle-the-request-get
https://forum.fhem.de/index.php?topic=68112.0
https://serverfault.com/questions/185894/proxy-error-502-reason-error-reading-from-remote-server-with-apache-2-2-3-de
https://community.atlassian.com/t5/Confluence-questions/502-PROXY-ERROR-when-trying-to-login-confluence/qaq-p/587799
https://forums.xt-commerce.com/topic/58918-bitte-dringend-hilfe-502-proxy-error/
https://github.com/mailcow/mailcow-dockerized/issues/1014
https://www.youtube.com/watch?v=0XQhiFCXnMw
https://support.oracle.com/knowledge/Oracle%20Database%20Products/2173923_1.html
http://znil.net/index.php/Apache2_als_http_/_https_Proxy_zu_anderen_Host
https://jazz.net/forum/questions/237668/the-proxy-server-received-an-invalid-response-from-an-upstream-server-the-proxy-server-could-not-handle-the-request-post-dwaj_acegi_security_check
http://cyn.in/home/cyn.in-users/hi-this-is-a-unique-problem-which-i-am-facing.-i-am-an-absolute-novice-in-the-matter-of-server-maintainence-i-am-trying-to-do-a-backup-and-restore-for-the-cyn.in-site.-now-i-have-done-it-1-time-when-it-was-successful.-but-now-i-am-facing-issues.-when-ma?set_language=da