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Set Host URL policy template not replacing the request URL

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Posted on by rohitsbots

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I am passing host url dynamically to custom connector action using Set Host URL policy template but not working. I used headers('containername') in the policy template but I'm getting error that the containername was not sent in headers.

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Policy Templates

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TF-12081155-0 2 on at

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Set Host URL policy template not replacing the request URL

I am having this same problem. The strange thing is that the policy is working on old connectors but if I try to create a new one I get the "[variable] is not present in headers error". I'm pretty sure this is a bug.

After messing around with this for a while I found that changing the policy from using the headers('[variable]') to queryParameters('[variable]') works.

(And also updating the header variable to a query variable in the Swagger editor.)

Whilst this is an effective workaround it's a pain because I use these connectors on all new environments and don't want to have to manually update the policy and variable type in each one. I know I could do this at source, but I'm not sure how this effects existing flows that use the connector.
CU21030433-0 8 on at

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Set Host URL policy template not replacing the request URL

Oops, accidentally posted trying to upload some screenshots to my previous post. Hope this helps.

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CU21030433-0 8 on at

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Set Host URL policy template not replacing the request URL

Since OP hasn't responded yet and I am getting the same error while trying to use Set host URL policy, I'll share what I have:

1. A header parameter called "new_url" in the Action Definition

2. A Set host URL policy applied to all actions that sets the URL from that parameter

3. Populating the parameter in my flow prior for the action

The error I get when I Test (similar error when I try to use query parameter as well):

{
"error": {
"code": 500,
"message": "Property with name new_url is not present in headers.",
"source": "unitedstates-002.azure-apim.net",
"path": "",
"policyId": "",
"clientRequestId": "",
"dreeSet": "true"
}
}

When I try to use it in a flow, it simply hangs and times out.
Michael E. Gernaey 39,785 Super User 2025 Season 1 on at

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Set Host URL policy template not replacing the request URL

Hello @rohitsbots

To quote my 2nd grade teacher lol, "show your work", at least I am pretty sure she said that.. that or, don't bring peanuts to class anymore, probably that too :-)

But in all seriousness, please share your work, versus just sort of explaining it and mentioning an error, that is also not shared.

Cheers and good luck!!