AWS S3 - How to fix 'The request signature we calculated does not match the signature' error?

Question

I have searched on the web for over two days now, and probably have looked through most of the online documented scenarios and workarounds, but nothing worked for me so far.

Answer 1

In my case the bucketname was wrong, it included the first part of the key (bucketxxx/keyxxx) - there was nothing wrong with the signature.