Maybe it's expensive to generate the 403 for a private subreddit.
A place I once worked had a 404 handler that was extremely expensive, but nobody noticed for a while because 404s are relatively rare. One time a vulnerability scanner took down the site because it was just hitting known vulnerability paths which all 404'd. The code that executed during a 404 was n^2.
A place I once worked had a 404 handler that was extremely expensive, but nobody noticed for a while because 404s are relatively rare. One time a vulnerability scanner took down the site because it was just hitting known vulnerability paths which all 404'd. The code that executed during a 404 was n^2.