Introduction to Cloud Hacking| flaws.cloud LEVEL 5

flaws.cloud -all levels
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Level 5
This EC2 has a simple HTTP only proxy on it. Here are some examples of it's usage:
•4d0cf09b9b2d761...
•4d0cf09b9b2d761...
•4d0cf09b9b2d761...
See if you can use this proxy to figure out how to list the contents of the level6 bucket at level6-cc4c404a8a8b876167f5e70a7d8c9880.flaws.cloud that has a hidden directory in it.
flaws.cloud LEVEL 5 Walkthrough