diff --git a/src/service/handler/cms_handler.e b/src/service/handler/cms_handler.e
index 56517e4..ae2f3b9 100644
--- a/src/service/handler/cms_handler.e
+++ b/src/service/handler/cms_handler.e
@@ -36,6 +36,18 @@ feature -- Response helpers
 --			res.send (create {CMS_REDIRECTION_RESPONSE_MESSAGE}.make (a_location))
 		end
 
+	send_bad_request_message (res: WSF_RESPONSE)
+			-- Send via `res' a bad request response.
+		do
+			res.send (create {CMS_CUSTOM_RESPONSE_MESSAGE}.make ({HTTP_STATUS_CODE}.bad_request))
+		end
+
+	send_not_found_message (res: WSF_RESPONSE)
+			-- Send via `res' a bad request response.
+		do
+			res.send (create {CMS_CUSTOM_RESPONSE_MESSAGE}.make ({HTTP_STATUS_CODE}.not_found))
+		end
+
 	send_access_denied_message (res: WSF_RESPONSE)
 			-- Send via `res' an access denied response.
 		do
diff --git a/src/service/response/cms_response.e b/src/service/response/cms_response.e
index b0dc598..0df5bf1 100644
--- a/src/service/response/cms_response.e
+++ b/src/service/response/cms_response.e
@@ -3,8 +3,8 @@ note
 			Generic CMS Response.
 			It builds the content to get process to render the output.
 		]"
-	date: "$Date: 2015-02-16 20:14:19 +0100 (lun., 16 févr. 2015) $"
-	revision: "$Revision: 96643 $"
+	date: "$Date: 2015-05-20 11:48:26 +0200 (mer., 20 mai 2015) $"
+	revision: "$Revision: 97327 $"
 
 deferred class
 	CMS_RESPONSE
@@ -40,14 +40,19 @@ feature {NONE} -- Initialization
 	initialize_site_url
 				-- Initialize site and base url.
 		local
-			l_url: detachable READABLE_STRING_8
+			l_url: detachable STRING_8
 			i,j: INTEGER
 		do
 				--| WARNING: do not use `absolute_url' and `url', since it relies on site_url and base_url.
-			l_url := setup.site_url
-			if l_url = Void then
+			if attached setup.site_url as l_site_url and then not l_site_url.is_empty then
+				create l_url.make_from_string (l_site_url)
+			else
 				l_url := request.absolute_script_url ("/")
 			end
+			check is_not_empty: not l_url.is_empty end
+			if l_url [l_url.count] /= '/' then
+				l_url.append_character ('/')
+			end
 			site_url := l_url
 			i := l_url.substring_index ("://", 1)
 			if i > 0 then
@@ -56,6 +61,9 @@ feature {NONE} -- Initialization
 					base_url := l_url.substring (j, l_url.count)
 				end
 			end
+		ensure
+			site_url_set: site_url /= Void
+			site_url_ends_with_slash: site_url.ends_with_general ("/")
 		end
 
 	register_hooks
@@ -98,6 +106,15 @@ feature -- Access
 	redirection: detachable READABLE_STRING_8
 			-- Location for eventual redirection.
 
+	location: STRING_8
+			-- Associated cms local location.
+		do
+			create Result.make_from_string (request.percent_encoded_path_info)
+			if not Result.is_empty and then Result[1] = '/' then
+				Result.remove_head (1)
+			end
+		end
+
 feature -- Internationalization (i18n)
 
 	translation (a_text: READABLE_STRING_GENERAL; opts: detachable CMS_API_OPTIONS): STRING_32
@@ -185,10 +202,10 @@ feature -- URL utilities
 			end
 		end
 
-	site_url: READABLE_STRING_8
+	site_url: IMMUTABLE_STRING_8
 			-- Absolute site url.
 
-	base_url: detachable READABLE_STRING_8
+	base_url: detachable IMMUTABLE_STRING_8
 			-- Base url if any.
 			--| Usually it is Void, but it could be
 			--|  /project/demo/
diff --git a/src/service/response/message/cms_custom_response_message.e b/src/service/response/message/cms_custom_response_message.e
new file mode 100644
index 0000000..7c2f435
--- /dev/null
+++ b/src/service/response/message/cms_custom_response_message.e
@@ -0,0 +1,64 @@
+note
+	description: "Custom cms response message."
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	CMS_CUSTOM_RESPONSE_MESSAGE
+
+inherit
+	CMS_RESPONSE_MESSAGE
+		redefine
+			send_payload_to
+		end
+
+create
+	make
+
+feature {NONE} -- Initialization
+
+	make (a_code: INTEGER)
+			-- Set `status_code' to `a_code'.
+		require
+			a_code_valid: a_code > 0
+		do
+			initialize
+			status_code := a_code
+		end
+
+feature -- Access
+
+	payload: detachable READABLE_STRING_8
+			-- Optional payload.
+
+feature -- Element change
+
+	set_status_code (a_code: INTEGER)
+			-- Set `status_code' to `a_code'.
+		require
+			a_code_valid: a_code > 0
+		do
+			status_code := a_code
+		end
+
+	set_payload (s: detachable READABLE_STRING_8)
+			-- Set `payload' to `s'.
+		do
+			if s /= Void then
+				payload := s
+				header.put_content_length (s.count)
+			else
+			end
+		end
+
+feature {WSF_RESPONSE} -- Output
+
+	send_payload_to (res: WSF_RESPONSE)
+			-- Send payload data to response `res'.
+		do
+			if attached payload as s then
+				res.put_string (s)
+			end
+		end
+
+end
diff --git a/src/theme/cms_theme.e b/src/theme/cms_theme.e
index f88f7e9..0bc2b69 100644
--- a/src/theme/cms_theme.e
+++ b/src/theme/cms_theme.e
@@ -1,7 +1,7 @@
 note
 	description: "Abstract class describing a generic theme"
-	date: "$Date: 2015-02-16 12:52:35 +0100 (lun., 16 févr. 2015) $"
-	revision: "$Revision: 96630 $"
+	date: "$Date: 2015-05-20 11:48:26 +0200 (mer., 20 mai 2015) $"
+	revision: "$Revision: 97327 $"
 
 deferred class
 	CMS_THEME
@@ -18,10 +18,10 @@ feature {NONE} -- Access
 
 	setup:  CMS_SETUP
 
-	site_url: READABLE_STRING_8 assign set_site_url
+	site_url: IMMUTABLE_STRING_8
 			-- Absolute URL for Current CMS site.
 
-	base_url: detachable READABLE_STRING_8
+	base_url: detachable IMMUTABLE_STRING_8
 			-- Optional base url of current CMS site.
 
 feature -- Access
@@ -59,16 +59,17 @@ feature -- Element change
 			i,j: INTEGER
 		do
 			base_url := Void
-			if a_url[a_url.count] = '/' then
-				site_url := a_url
+			if a_url [a_url.count] = '/' then
+				create site_url.make_from_string (a_url)
 			else
-				site_url := a_url + "/"
+				create site_url.make_from_string (a_url + "/")
 			end
+
 			i := a_url.substring_index ("://", 1)
 			if i > 0 then
 				j := a_url.index_of ('/', i + 3)
 				if j > 0 then
-					base_url := a_url.substring (j, a_url.count)
+					create base_url.make_from_string (a_url.substring (j, a_url.count))
 				end
 			end
 		end