Save erroneous frames in logs

[yulgolem]

ATM erroneous frames are just dropped off and proxy is trying to get base_error_url().
The problem is in this case we do not know what ind of a request was the reason of an error, so we need to save either all or just erroneous request frames in some log for further analysis.

Error request example from the registry side: https://gist.githubusercontent.com/ratM1n/9b39d6d72bd7e8dba3cb8f740fca8f7e/raw/105c6f06929e00d86568a36446bee63679b1d1b6/gistfile1.txt