safeurl

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I am creating this pull request in order to resolve a couple of security vulnerabilities found in this repo. Let me know if you have any questions. Thanks

labhacker1

Issue with processing http://127.1 URL

4

A Tweeter user [mentioned](https://twitter.com/padovah4ck/status/1603480295927431168) that, when running the CTF [challenge](https://blog.doyensec.com/2022/12/13/safeurl.html) locally, requests such as: ``` curl 'http://127.0.0.1/webhook?url=http://127.1' ``` return the following error message: ``` dial tcp: lookup 127.1: no such...

v1ktor0t