Overwriting a host header in webhooks

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1

I’m trying to find a workaround for a webhook configuration where modifying the host header is not allowed.

Context:

I have a REST API datasource which is using an agent. I am trying to create a webhook which calls a POST endpoint using an IP address, but it requires the host header set to HOST_XXX (where XXX is a number). Since it is not allowed to modify the host header in the webhook configuration, I’m looking for alternative solutions.

What I’ve Tried:

I attempted the following workaround:

  1. Added an entry to /etc/hosts on the agent machine:
   10.xxx.xxx.xx HOST_XXX
  1. Changed the webhook to call HOST_XXX instead of the IP address directly

The idea was that by using the domain name, the host header would automatically be set correctly.

The Problem:

I’m getting an “invalid domain” error with this approach.

Questions:

  1. Seems like this error is caused by the underscore in the domain name (HOST_XXX)? Would it be possible to allow the host with “_” if this is the right workaround?

  2. What’s the recommended workaround when you can’t modify the host header in webhook configurations?

Any guidance would be appreciated!

2

The recommended solution here is to hit the api directly in the code repo using an agent proxy policies.

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