diff -ru ./forward.c.ori ./forward.c
--- ./forward.c.ori	2015-08-24 22:06:16.000000000 +0200
+++ ./forward.c	2015-08-24 21:52:07.000000000 +0200
@@ -505,9 +505,9 @@
 				 */
 				if (data[0]->http_version >= 11)
 					data[0]->headers = hlist_mod(data[0]->headers, "Proxy-Connection", "keep-alive", 1);
-
+                    data[0]->headers = hlist_mod(data[0]->headers, "X-Forwarded-For", inet_ntoa(caddr.sin_addr), 1);
 				/*
-				 * Also remove runaway P-A from the client (e.g. Basic from N-t-B), which might
+				 * Also remove runaway P-A from the client (e.g. Basic from N-t-B), which might
 				 * cause some ISAs to deny us, even if the connection is already auth'd.
 				 */
 				while (hlist_get(data[loop]->headers, "Proxy-Authorization")) {