Web Security Academy lists alternate encodings that resolve to localhost, and drak3hft7 says octal encoding helped bypass SSRF restrictions in a real exploit.
Your SSRF filter blocks 127.0.0.1 and localhost. That's okay! Try these:
2130706433 (decimal)
017700000001 (octal)
0x7f000001 (hex)
This exact trick recently helped me bypass restrictions and successfully exploit an SSRF.
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