To get access to the webhook headers on Zapier, I think you will need to use the ‘Catch Raw Hook’ option for the webhook on Zapier. This topic gives an example of how to do that for a User Event webhook: Create a Salesforce lead via Zapier when a user signs up on Discourse. Setting up a Zap to listen for a Post Event webhook and filter out all requests where the X-Discourse-Event is set to post_edited will be quite similar.
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