Aiohttp-cors
lastmod 2021-09-18created 2021-03-034 edits
Troubleshooting
CORS malfunction with Variable Resources
When a path like /{plugin}/{tail:.*} is bound to multiple METHODs, CORS does not work. (It is a bug)
The cause of the above problem can be found in aiohttp, in the add_resource method of the UrlDispatcher class in web_urldispatcher.py.
def add_resource(self, path: str, *, name: Optional[str] = None) -> Resource:
if path and not path.startswith("/"):
raise ValueError("path should be started with / or be empty")
# Reuse last added resource if path and name are the same
if self._resources:
resource = self._resources[-1]
if resource.name == name and resource.raw_match(path):
return cast(Resource, resource)
if not ("{" in path or "}" in path or ROUTE_RE.search(path)):
resource = PlainResource(_requote_path(path), name=name)
self.register_resource(resource)
return resource
resource = DynamicResource(path, name=name)
self.register_resource(resource)
return resource
Because it is treated as False in the condition if not ("{" in path or "}" in path or ROUTE_RE.search(path)): on the 9th line above,
!!!!!!!!!!! ... wait... maybe not? Let's check again.