Explicitly set some common headers

Author: rolandgeider

config/Caddyfile.example

@@ -32,7 +32,12 @@ localhost {
 
     encode
 
-    reverse_proxy web:8000
+    reverse_proxy web:8000 {
+        header_up Host {host}
+        header_up X-Real-IP {remote_host}
+        header_up X-Forwarded-For {http.X-Forwarded-For} {remote_host}
+        header_up X-Forwarded-Proto {scheme}
+    }
 
     handle /static/* {
         root * /wger