AWSS3 headObject returns Error Domain=com.amazonaws.AWSS3ErrorDomain Code=0 instead of AWSS3ErrorNoSuchKey

[bvirlet]

Describe the bug

When performing a AWSS3.headObject on a missing key, the SDK returns a Error Domain=com.amazonaws.AWSS3ErrorDomain Code=0 instead of a AWSS3ErrorNoSuchKey code.

To Reproduce
Steps to reproduce the behavior, make a headObject request on a missing key.

Observed Behavior

No result is present as expected, but the error is Error Domain=com.amazonaws.AWSS3ErrorDomain Code=0.

s3.headObject(request).continueWith(block: { task in
    if let result = task.result {
        print(result)
    }
    print(error)
})

Expected Behavior

The error should be AWSS3ErrorNoSuchKey. This is what is documented:

An instance of AWSTask. On successful execution, task.result will contain an instance of AWSS3HeadObjectOutput. On failed execution, task.error may contain an NSError with AWSS3ErrorDomain domain and the following error code: AWSS3ErrorNoSuchKey.

Areas of the SDK you are using (AWSMobileClient, Cognito, Pinpoint, IoT, etc)?
AWSS3

Environment(please complete the following information):

• SDK Version: 2.40.0 (2.23.0 as well)
• Dependency Manager: SPM
• Swift Version : 5.0
• Xcode Version: 16.1

Additional context

I think the problem is that the HEAD request doesn't return a body, but the SDK parses errors from the body. In the case of an HEAD request, the NoSuchKey error should just be inferred from the HTTP 404 status as head object requests from S3 don't return a body.

[thisisabhash]

Thank you for posting this issue. Our team will take a look and post updates here.