Slack Mutual TLS Recipe: Adding X-Client-Certificate-SAN header from client certificate

Problem this snippet solves: The following is based on the documentation from Slack of how to authenticate requests from Slack via mutual TLS and pass along the information to a service that is not ...
Published Jul 10, 2019
Version 1.0
cloud
iRules
slack
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adidasn2022
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Jan 26, 2022

Hi Eric_Chen 

Hope all is well.

I'm trying to create an rule whereby it extract the TLS cert DNS name and populate value into a new header field:
in x-forwarded-host-chkd.

Is this easily done? Thanks