use hmac compare instead of direct compare #1
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As per https://api.slack.com/docs/verifying-requests-from-slack - "Compare the resulting signature to the header on the request. Note: for best practice, use an hmac compare function instead of directly comparing the signatures for equality."
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As per https://api.slack.com/docs/verifying-requests-from-slack - "Compare the resulting signature to the header on the request. Note: for best practice, use an hmac compare function instead of directly comparing the signatures for equality."