#2671 Apache reverse proxy (#2919)

* #2671 Apache reverse proxy

Adding sample configuration for using apache as a reverse proxy

* Update Docker/README.md

Better wording

Co-Authored-By: Frans de Jonge <fransdejonge@gmail.com>

* Update Docker/README.md

Better wording

Co-Authored-By: Frans de Jonge <fransdejonge@gmail.com>

* Included suggestions and cleaned up code

I have cleaned the code with the <location> Tags so that it is more concise

* Included corrections

* Update Docker/README.md

Minor port number

Co-authored-by: Frans de Jonge <fransdejonge@gmail.com>
Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>

Docker/README.md

@@ -351,3 +351,20 @@ server {
 	}
 }
 ```
+### Alternative reverse proxy using [Apache 2.4](https://httpd.apache.org/docs/2.4/howto/reverse_proxy.html)
+
+Here is an example of a configuration file for running FreshRSS behind an Apache reverse proxy (as a subdirectory).
+You need a working SSL configuration and the Apache modules `proxy`, `proxy_http` and and `headers`installed (depends on your distribution) and enabled (```a2enmod proxy proxy_http headers```).
+
+```
+ProxyPreserveHost On
+
+<Location /freshrss/>
+  ProxyPass http://127.0.0.1:8080/
+  ProxyPassReverse http://127.0.0.1:8080/
+  RequestHeader set X-Forwarded-Prefix "/freshrss"
+  RequestHeader set X-Forwarded-Proto "https"
+  Require all granted
+  Options none
+</Location>
+```