PermissionError: The request signature we calculated does not match the signature you provided. Check your key and signing method.

Hello,

I'm trying s3fs with Synology C2 storage (it seems to be an inexpensive S3 like storage)
https://c2.synology.com/
https://c2.synology.com/en-global/object-storage/overview
They say "Compatible with Amazon S3 API / Use your existing tools and code as our API is S3-compatible."
See https://kb.synology.com/en-global/C2/tutorial/C2_Object_Storage_Compatible_API

I'm doing

In [1]: import s3fs

In [2]: url="https://eu-002.s3.synologyc2.net"

In [3]: key="MyKey"

In [4]: secret="MySecret"

In [5]: s3 = s3fs.core.S3FileSystem(endpoint_url=url, key=key, secret=secret)

In [6]: s3.ls("my-bucket")

but it raises

PermissionError: The request signature we calculated does not match the signature you provided. Check your key and signing method.

I haven't find any other issue https://github.com/fsspec/s3fs/issues?q=is%3Aissue+permissionerror+signature

Any idea what's wrong ?

Kind regards

Start by reproducing the Python example with s3fs.core.S3FileSystem, the Synology C2 endpoint_url, and s3.ls("my-bucket"). Investigate how this endpoint is signed and determine whether the request can be made compatible with Synology C2; done means the example lists the bucket successfully or the required limitation and configuration are documented.