Removed blacklist header from canonical calc#480
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Referencing the aws-sdk-php repo, removed the "Content-Type" header from being signed due to its existence on the header blacklist.
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In building a backend system to recreate and verify client request before signing them, I noticed the AWS SDK for PHP have blacklist of headers for those it will not sign.
As such, I have removed the
content-lengthheader fromAwsSignatureV4.prototype.canonicalHeadersfunction to align with AWS's signature process.AWS-SDK reference: https://github.com/aws/aws-sdk-php/blob/6ef06165ef815358d3e60872b4c9f6c10deb3816/src/Signature/SignatureV4.php#L40-L74