The not-match should also include slash. This prevents redirection to https://mydomain.com/plexpy/auth/logout:443

Frequently-Asked-Questions-(FAQ).md

@@ -147,7 +147,7 @@ location /plexpy/ {
             set $xforwardedssl "on";
     }
     proxy_set_header X-Forwarded-Ssl $xforwardedssl;
-    proxy_redirect ~^(http(?:s)?://)([^:]+)(?::\d+)?(/.*)?$ $1$2:$server_port$3;
+    proxy_redirect ~^(http(?:s)?://)([^:/]+)(?::\d+)?(/.*)?$ $1$2:$server_port$3;
 }
 ```