diff --git a/library/server/request/router/router-safe.ecf b/library/server/request/router/router-safe.ecf
index eba5a022..f7aff5b6 100644
--- a/library/server/request/router/router-safe.ecf
+++ b/library/server/request/router/router-safe.ecf
@@ -24,7 +24,7 @@
 			<exclude>/EIFGENs$</exclude>
 			<exclude>/.svn$</exclude>
 		</file_rule>
-		<option warning="true" full_class_checking="true" is_attached_by_default="true" void_safety="all">
+		<option warning="true" full_class_checking="true" is_attached_by_default="true" void_safety="all" syntax="provisional">
 			<assertions precondition="true"/>
 		</option>
 		<library name="base" location="$ISE_LIBRARY\library\base\base-safe.ecf"/>
diff --git a/library/server/request/router/router.ecf b/library/server/request/router/router.ecf
index b336e855..93fae79f 100644
--- a/library/server/request/router/router.ecf
+++ b/library/server/request/router/router.ecf
@@ -24,7 +24,7 @@
 			<exclude>/EIFGENs$</exclude>
 			<exclude>/.svn$</exclude>
 		</file_rule>
-		<option warning="true" full_class_checking="true">
+		<option warning="true" full_class_checking="true" syntax="provisional">
 			<assertions precondition="true"/>
 		</option>
 		<library name="base" location="$ISE_LIBRARY\library\base\base.ecf"/>
diff --git a/library/server/request/router/src/request_handler.e b/library/server/request/router/src/request_handler.e
index 30f0fc54..76ba939b 100644
--- a/library/server/request/router/src/request_handler.e
+++ b/library/server/request/router/src/request_handler.e
@@ -65,6 +65,13 @@ feature -- Execution: report
 			result_attached: Result /= Void
 		end
 
+feature {REQUEST_ROUTER} -- Routes change
+
+	on_handler_mapped (a_resource: READABLE_STRING_8; a_rqst_methods: detachable ARRAY [READABLE_STRING_8])
+			-- Callback called when a router map a route to Current handler
+		do
+		end
+
 note
 	copyright: "2011-2011, Eiffel Software and others"
 	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
diff --git a/library/server/request/router/src/uri/request_uri_router_i.e b/library/server/request/router/src/uri/request_uri_router_i.e
index b699f6c0..c82b2089 100644
--- a/library/server/request/router/src/uri/request_uri_router_i.e
+++ b/library/server/request/router/src/uri/request_uri_router_i.e
@@ -26,6 +26,7 @@ feature -- Registration
 	map_with_request_methods (p: READABLE_STRING_8; h: H; rqst_methods: detachable ARRAY [READABLE_STRING_8])
 		do
 			handlers.force ([h, p, formatted_request_methods (rqst_methods)])
+			h.on_handler_mapped (p, rqst_methods)
 		end
 
 feature {NONE} -- Access: Implementation
diff --git a/library/server/request/router/src/uri_template/request_uri_template_router_i.e b/library/server/request/router/src/uri_template/request_uri_template_router_i.e
index d2f61c4d..2b50ba4d 100644
--- a/library/server/request/router/src/uri_template/request_uri_template_router_i.e
+++ b/library/server/request/router/src/uri_template/request_uri_template_router_i.e
@@ -33,6 +33,7 @@ feature -- Registration
 		do
 			handlers.force ([h, uri.template, formatted_request_methods (rqst_methods)])
 			templates.force (uri, uri.template)
+			h.on_handler_mapped (uri.template, rqst_methods)
 		end
 
 	map_with_request_methods (tpl: READABLE_STRING_8; h: H; rqst_methods: detachable ARRAY [READABLE_STRING_8])