Use HTTP_HEADER instead of WSF_HEADER

(WSF_HEADER is kept for convenience and existing code)

draft/library/server/request/rest/tests/src/app/app_account_verify_credential.e

@@ -55,7 +55,7 @@ feature -- Execution
 	execute_application (ctx: APP_REQUEST_HANDLER_CONTEXT; req: WSF_REQUEST; res: WSF_RESPONSE)
 		local
 			l_full: BOOLEAN
-			h: WSF_HEADER
+			h: HTTP_HEADER
 			l_login: STRING_8
 			s: STRING
 			content_type_supported: ARRAY [STRING]

draft/library/server/request/rest/tests/src/app/app_test.e

@@ -42,7 +42,7 @@ feature -- Execution
 			-- Execute request handler
 		local
 			s: STRING
-			h: WSF_HEADER
+			h: HTTP_HEADER
 		do
 			create h.make
 			h.put_content_type_text_plain