If you need to convert something to Markdown, you can try our service: http://convert.nonameconctf2018.xyz
This challenge quickly illustrates a SSRF.
One of the first things I tried was to access
localhost / 127.0.0.1, but without success:
So I decided to try to do with
0.0.0.0 and it worked!
But I did not know what to look for, so I did the simple, a brute of directories:
So finally, I just did the ssrf asking for the file: