Why Does My Amazon S3 Upload Fail with a 'Request Signature Mismatch' Error?

Amazon S3: Troubleshooting "Request Signature Mismatch" Error

The "The request signature we calculated does not match the signature you provided" error in Amazon S3 can be a frustrating issue to encounter. After extensive research, you have identified the problem lies within your PHP code.

The issue stems from the object key you have assigned. Specifically, the key begins with a period (e.g., ..imagesABC.jpg). This unconventional naming convention conflicts with Amazon S3's expectations and triggers the signature mismatch error.

To resolve this issue, ensure that your object keys do not start with a period. Adhering to this convention will prevent the signature calculation from failing.

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