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When you programmatically call the functionality exposed by the Amazon SQS API, all calls sent to Amazon SQS must be signed. If you use an AWS SDK, the SDK handles the signing process for you so that you do not have to manually complete the tasks. On the other hand, if you submit a Query request over HTTP/HTTPS, then you must include a signature in every Query request.
Amazon SQS supports both signature version 2 and signature version 4. If you are creating new applications that use Amazon SQS, then you should use signature version 4.
For information on how to create the signature using signature version 4, see Signature Version 4 Signing Process in the AWS General Reference.
For information on how to create the signature using signature version 2, see Signature Version 2 Signing Process in the AWS General Reference.