Index: src/http.c
===================================================================
RCS file: /squid/squid/src/http.c,v
retrieving revision 1.459
diff -u -r1.459 http.c
--- src/http.c	17 Jun 2010 02:15:45 -0000	1.459
+++ src/http.c	10 Apr 2012 10:43:40 -0000
@@ -1429,6 +1429,12 @@
 	if (flags.front_end_https == 1 || request->protocol == PROTO_HTTPS)
 	    httpHeaderPutStr(hdr_out, HDR_FRONT_END_HTTPS, "On");
     }
+	
+	header_mangler *hm;
+    hm = &Config.header_access[HDR_USER_AGENT];    
+    if (!httpHeaderHas(hdr_out, HDR_USER_AGENT)) {
+    	    httpHeaderPutStr(hdr_out, HDR_USER_AGENT,hm->replacement );
+    }
     /* Now mangle the headers. */
     httpHdrMangleList(hdr_out, orig_request);
     stringClean(&strConnection);