URL can't contain control characters. '/2021/10/iron-will.h! tml' (found at least ' ') (InvalidURL; misconfigured server?) [help]
Sorry
An error occurred while trying to validate this feed.
Possible causes:
The address may be incorrect. Make sure the address is spelled correctly. Try loading the feed directly in your browser to make sure a feed exists at that address.
The feed may be temporarily unavailable. The server may be down, or too slow. Try again later.
The validator may be busted. If the feed exists, the server is fine, and the problem is reproducible, let us know on the Feed Validator Issues page on GitHub.