Amazon S3 - How to fix 'The request signature we calculated does not match the signature' error?

✔ Recommended Answer

After two days of debugging, I finally discovered the problem...

The key I was assigning to the object started with a period i.e. ..\images\ABC.jpg, and this caused the error to occur.

I wish the API provides more meaningful and relevant error message, alas, I hope this will help someone else out there!

Source: stackoverflow.com

Answered By: Joseph Lam

Method #2

The "The request signature we calculated does not match the signature" error typically occurs when the signature generated for a request to Amazon S3 does not match the signature that Amazon S3 expects.

Here are some steps you can take to fix this error:

  1. Check your AWS access key and secret access key: Ensure that your AWS access key and secret access key are correct and valid. You can find your AWS access key and secret access key in the AWS Management Console under the IAM service.

  2. Check the system time on your computer: Ensure that the system time on the computer you are using to make the API call is accurate. If the system time is incorrect, it can result in an invalid signature.

  3. Check the signature version: Ensure that you are using the correct signature version. Amazon S3 supports both Signature Version 2 and Signature Version 4. If you are using Signature Version 2, you should switch to Signature Version 4.

  4. Check the region: Ensure that you are sending your request to the correct region. If you are using an incorrect region, Amazon S3 will not recognize the signature.

  5. Check the request headers: Ensure that the headers in your request are correctly formatted and sorted alphabetically. The headers must be sorted in ascending order by header name.

  6. Check the request body: Ensure that the request body is included in the signature calculation. If the request body is not included, the signature will not match.

  7. Check if the bucket name is valid: Make sure that the bucket name is valid, and it is not containing any capital letters or special characters except for the period (.) or hyphen (-).

If none of the above steps resolve the issue, you can try regenerating your AWS access key and secret access key, and then reattempting the request.

I hope these steps help you resolve the "The request signature we calculated does not match the signature" error in Amazon S3.

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