Include the `url' in the http client response.

This way, we can get the real url used by the lib, especially when there are query parameters.

library/network/http_client/src/http_client_response.e

@@ -13,11 +13,12 @@ create
 
 feature {NONE} -- Initialization
 
-	make
+	make (a_url: like url)
 			-- Initialize `Current'.
 		do
 				--| Default values
 			status := 200
+			url := a_url
 			create {STRING_8} raw_header.make_empty
 		end
 
@@ -36,6 +37,9 @@ feature {HTTP_CLIENT_REQUEST} -- Status setting
 
 feature -- Access
 
+	url: STRING_8
+			-- URL associated with Current response
+
 	status: INTEGER assign set_status
 			-- Status code of the response.