Add more client errors

src/cenao/view.py

@@ -35,6 +35,30 @@ class ClientError(ViewError):
     reason_format = 'Unknown client error'
 
 
+class ClientUnauthorizedError(ViewError):
+    code = 4001
+    status = 401
+    reason_format = 'Unauthorized error'
+
+
+class ClientForbiddenError(ViewError):
+    code = 4003
+    status = 403
+    reason_format = 'Forbidden error'
+
+
+class ClientMethodNotAllowedError(ViewError):
+    code = 4005
+    status = 405
+    reason_format = 'Method not allowed error'
+
+
+class ClientConflictError(ViewError):
+    code = 4009
+    status = 409
+    reason_format = 'Conflict error'
+
+
 class ServerError(ViewError):
     code = 5000
     status = 500