When we intercept the request of

http://20yjtzrx50hpypicbajmro9dy.ctf.p0wnhub.com:8888/

We see that it is redirecting to firebase host related to HZVIII which is:

```
hzviii.firebaseio.com
```

and when we search on internet we can get some information about misconfiguration in firebases
which appears in ".json" so we proceed the request

```
hzviii.firebaseio.com/.json
```

And Bingo we get the Flag:

```
{"flag":"HZVIII{f1r3b453_d474b453_m15c0nf16ur4710n}"}
```