Added debug clause to detect in WSF_ROUTER.map_with_request_methods the existing conflicts with similar mapping.

Added smart handling of HEAD request.
Exported some internal features of WSF_REQUEST and WSF_RESPONSE to respectively WSF_REQUEST_EXPORTER and WSF_RESPONSE_EXPORTER

library/server/wsf/src/wsf_head_response_wrapper.e

@@ -0,0 +1,81 @@
+note
+	description: "[
+					This class is a wrapper on a standard WSF_RESPONSE
+					It is used to compute a HEAD request based on a GET request method handling
+				]"
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	WSF_HEAD_RESPONSE_WRAPPER
+
+inherit
+	WSF_RESPONSE
+		redefine
+			put_character,
+			put_string,
+			put_substring,
+			put_chunk,
+			put_chunk_end
+		end
+
+	WSF_RESPONSE_EXPORTER
+
+create
+	make_from_response
+
+feature {NONE} -- Initialization
+
+	make_from_response (res: WSF_RESPONSE)
+		do
+			wsf_response := res
+			make_from_wgi (res.wgi_response)
+		end
+
+feature {WSF_RESPONSE} -- Access
+
+	wsf_response: WSF_RESPONSE
+			-- Wrapped response
+
+feature -- Output operation
+
+	put_character (c: CHARACTER_8)
+		do
+			-- HEAD has no content
+		end
+
+	put_string (s: READABLE_STRING_8)
+		do
+			-- HEAD has no content
+		end
+
+	put_substring (s: READABLE_STRING_8; a_begin_index, a_end_index: INTEGER)
+		do
+			-- HEAD has no content
+		end
+
+	put_chunk (s: READABLE_STRING_8; a_extension: detachable READABLE_STRING_8)
+		do
+			-- HEAD has no content
+		end
+
+	put_chunk_end
+		do
+			-- HEAD has no content
+		end
+
+invariant
+	transfered_content_length_is_zero: transfered_content_length = 0
+
+note
+	copyright: "2011-2012, Jocelyn Fiat, Javier Velilla, Olivier Ligot, Eiffel Software and others"
+	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
+	source: "[
+			Eiffel Software
+			5949 Hollister Ave., Goleta, CA 93117 USA
+			Telephone 805-685-1006, Fax 805-685-6869
+			Website http://www.eiffel.com
+			Customer support http://support.eiffel.com
+		]"
+
+end