Not using updated feed locations critical
When a feed from a website is moved to a new location, the website informs the application where the feed has been moved to. However, instead of using the new locations of feeds, this application continuously tries to request feeds from their old locations.
Why it's a problemIt causes websites to use more computer resources than necessary to forcibly redirect the application to the rightful place over and over again.
What it means for usersFeeds will stop working or become fully inoperable when a website blocks the application due to this behavior.
How to fix itWhen a feed has been relocated to a new URL, the application should use the new URL and cease attempting to request feed content from the old one.