Created by wtfismyip.com - had a good laugh

Is there a bug bounty? I found an open redirect.

"You cannot add 127.0.0.1 or localhost as a callback URL"

...watch me.

Fortunately, redirection to a file: URL will result in a browser error. Unfortunately, the browser does not explain what is wrong (although the redirect can be viewed in the developer tools, you might not know to look there, and it still doesn't have an error message to explain the problem).

  metadata.301party.com: 169.254.169.254
  ipv6.metadata.301party.com: [::169.254.169.254]

Why not just one name with both A and AAAA records? ...er, and why not fd00:ec2::254? (I now suspect that there's a subjoke here that I'm missing)

Couple of s/redirct/redirect typos

Can someone explain what this is?

Also of interest: https://redirect.pizza/

I found a couple of fun tricks you can do with this (for some definition of "fun" anyway).

Go's http.Redirect function allows non-3xx statuses, and also renders a trivial page with a status message and link:

https://301party.com/451?url=javascript:alert(%27hello%27)

Alas not infinitely recursive but enough to make your browser give up:

https://301party.com/301?url=/301?url=/301?url=/301?url=/301...

[edit to add:] https://301party.com/0 causes a panic