Reviewed the semantic of the handler context.

Adapted existing code to fit the new router design.

library/server/wsf/router/support/starts_with/wsf_starts_with_handler.e

@@ -0,0 +1,36 @@
+note
+	description: "Summary description for {WSF_STARTS_WITH_HANDLER}."
+	author: ""
+	date: "$Date$"
+	revision: "$Revision$"
+
+deferred class
+	WSF_STARTS_WITH_HANDLER
+
+inherit
+	WSF_HANDLER
+
+feature -- Execution
+
+	execute (a_start_path: READABLE_STRING_8; req: WSF_REQUEST; res: WSF_RESPONSE)
+		deferred
+		end
+
+feature {WSF_ROUTER} -- Mapping
+
+	new_mapping (a_uri: READABLE_STRING_8): WSF_STARTS_WITH_MAPPING
+		do
+			create Result.make (a_uri, Current)
+		end
+
+note
+	copyright: "2011-2012, Jocelyn Fiat, Javier Velilla, 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

library/server/wsf/router/support/starts_with/wsf_starts_with_mapping.e

@@ -0,0 +1,74 @@
+note
+	description: "Summary description for EWF_STARTS_WITH_PATH."
+	author: ""
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	WSF_STARTS_WITH_MAPPING
+
+inherit
+	WSF_ROUTER_MAPPING
+
+create
+	make
+
+feature {NONE} -- Initialization
+
+	make (a_uri: READABLE_STRING_8; h: like handler)
+		do
+			handler := h
+			uri := a_uri
+		end
+
+feature -- Access
+
+	handler: WSF_STARTS_WITH_HANDLER
+
+	uri: READABLE_STRING_8
+
+feature -- Status
+
+	routed_handler (req: WSF_REQUEST; res: WSF_RESPONSE; a_router: WSF_ROUTER): detachable WSF_HANDLER
+			-- Return the handler if Current matches the request `req'.
+		local
+			p: READABLE_STRING_8
+			s: like based_uri
+		do
+			p := path_from_request (req)
+			s := based_uri (uri, a_router)
+			if p.starts_with (s) then
+				Result := handler
+				a_router.execute_before (Current)
+				handler.execute (s, req, res)
+				a_router.execute_after (Current)
+			end
+		end
+
+feature {NONE} -- Implementation
+
+	based_uri (a_uri: like uri; a_router: WSF_ROUTER): like uri
+			-- `uri' prefixed by the `WSF_ROUTER.base_url' if any
+		local
+			s: STRING_8
+		do
+			if attached a_router.base_url as l_base_url then
+				create s.make_from_string (l_base_url)
+				s.append_string (a_uri)
+				Result := s
+			else
+				Result := a_uri
+			end
+		end
+
+note
+	copyright: "2011-2012, Jocelyn Fiat, Javier Velilla, 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