How to Fix the 'The Request Signature We Calculated Does Not Match the Signature You Provided' Error in Amazon S3 with AWS PHP SDK?

Troubleshooting 'The Request Signature We Calculated Does Not Match the Signature You Provided' Error in Amazon S3 with AWS PHP SDK

When attempting to connect to Amazon S3 using the AWS PHP SDK, developers may encounter the error "The request signature we calculated does not match the signature you provided. Check your key and signing method." Despite verifying access keys, generating new ones, and adjusting credential passing methods, the issue persists.

This obscure error can result from an unexpected source - object keys beginning with a period ("."). In the code provided, the object key is defined as "..imagesABC.jpg".

When the object key starts with a period, the SDK assumes that it is an absolute path and signs the request accordingly. However, Amazon S3 does not accept object keys beginning with a period, causing the signature mismatch.

Solution:

To resolve this error, simply modify the object key to remove the leading period, ensuring it is a valid relative path within the bucket. For example, change "..imagesABC.jpg" to "images/ABC.jpg".

Once the object key is adjusted, the SDK will create the appropriate signature and the operation will succeed.

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