Why is my Amazon S3 request resulting in a 'Request Signature Mismatch' error?

Amazon S3: Resolving "Request Signature Mismatch" Error

This frequently encountered error during Amazon S3 operations can stem from various reasons. While many potential solutions have been documented, some may escape the initial troubleshooting. Here, we delve into one such specific cause that often goes unnoticed:

Key Naming Conventions

When assigning keys to objects in S3, it's essential to adhere to specific naming conventions. One critical aspect is avoiding using periods (.) as the first character in the key.

As evidenced in the example code provided, the keyname is set to "..imagesABC.jpg". This naming convention triggers the error mentioned.

Solution

To resolve this issue, simply avoid starting the key with a period. A proper key should look like "images/ABC.jpg" without the leading period. By adhering to this convention, the request signature calculation will align with the server's expectations, leading to a successful operation.

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