Recently I tried to log onto Biology SE for the first time. I clicked "log in", clicked the "MyOpenID" icon, entered the credentials on MyOpenID, then I was presented with "you have account on other sites" page and clicked "confirm and create".
Normally I would get logged in, but this time some generic error occurred and I got to https://biology.stackexchange.com/error?aspxerrorpath=/users/openidconfirm
I wanted to repro the problem and so edited the URL and tried to open https://biology.stackexchange.com/users/openidconfirm - I saw a HTTP 404 page with me signed in at the top of the page.
Not that I care much about an accidential error, but why would opening https://biology.stackexchange.com/users/openidconfirm result in HTTP 404 instead of redirecting me to the main page? I mean the page is to "confirm the OpenID" and I've already have it confirmed, so it's reasonable to just ignore the attempt and pretend nothing happened instead of showing me a 404 error page.
Could you please replace the HTTP 404 with forwarding in this case?