Move HTTPError remap up the stack

Author: vidartf

jupyter_server/services/contents/filemanager.py

@@ -74,13 +74,6 @@ def _default_preferred_dir(self):
                 return os.path.relpath(value, self.root_dir).replace(os.path.sep, "/")
         return "/"
 
-    @validate("preferred_dir")
-    def _validate_preferred_dir(self, proposal):
-        try:
-            return super()._validate_preferred_dir(proposal)
-        except HTTPError as e:
-            raise TraitError(e.log_message) from e
-
     @default("checkpoints_class")
     def _checkpoints_class_default(self):
         return FileCheckpoints

jupyter_server/services/contents/manager.py

@@ -86,7 +86,11 @@ def emit(self, data):
     @validate("preferred_dir")
     def _validate_preferred_dir(self, proposal):
         value = proposal["value"]
-        if not self.dir_exists(value):
+        try:
+            dir_exists = self.dir_exists(value)
+        except HTTPError as e:
+            raise TraitError(e.log_message) from e
+        if not dir_exists:
             raise TraitError(_i18n("Preferred directory not found: %r") % value)
         return value