Power Platform Community Forum Thread Details

Is there any supported way to read the Authorization response header from a login call within Power Automate (cloud flow or custom connector), given it appears to be filtered at the platform level?
Someone suggested using a custom connector with API Key security + Secure Outputs so the connector "parses the Authorization header internally and passes it to later steps." Does this actually capture a token returned by a login response, or does API Key auth only replay a token I already hold? My reading of the docs is the latter, but I'd like confirmation.
If it genuinely can't be done natively, what's the lightest reliable pattern people use, Power Automate Desktop's "Invoke web service" (which returns raw header), an Azure Function proxy that returns the token in a JSON body, or something else?

Authorization Response Header From Login Call.png

Categories:

Power Automate Mobile App

Hi there!

Here's my recommended steps:

- get the API changed to return the token in the body. Easiest/fastest.

{
"access_token": "abc123",
"expires_in": 3600
}

- use a tiny Azure Function proxy.

- use PAD as the last resort.

Set HTTP Header | Microsoft Learn

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