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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
The trick is to use a vertical tab (`%09`) and then place another URL in the tag. So once a victim clicks the link on the error page, she will go somewhere else.

As you can see, the browser changes the destination from relative / to an absolute url https://enoflag.de. The exploit is `http://domain.tld/%09//otherdomain.tld`

Here's the httpd configuration to reproduce the behavior:

```
    <Location />
        ProxyPass http://127.0.0.1:9000/ connectiontimeout=1 timeout=2
        ProxyPassReverse http://127.0.0.1:9000/ 
        Order allow,deny
        Allow from all
    </Location>
```