After importing an Azure Function app into API Management service, how do I view/edit the policy adding the generated host key authorizing calls?

Question

I have imported an Azure Function app into Azure API Management service, which automatically generates a host key on the Function app for authorizing calls against it.

I would like to inspect the associated policy (if one exists) and edit it, but I can't find it anywhere - it's not shown in "Policy fragments".

How can I view/edit the policy that adds the generated function key to calls against the Function app?

Answer 1

• Navigate to any operation which got added post importing a Function App in APIM. Lets say, in my case its HttpTrigger1. Then, click on Inbound processing policies --> </>.

• This will give you below policy.

<policies>
    <inbound>
        <base />
        <set-backend-service id="apim-generated-policy" backend-id="afreeen-fa" />
    </inbound>
    <backend>
        <base />
    </backend>
    <outbound>
        <base />
    </outbound>
    <on-error>
        <base />
    </on-error>
</policies>

• This policy signifies that, the operation is referring to a backend Id afreeen-fa which is created in APIs --> Backends blade of APIM instance.

• Click on the backend name and then navigate to Authorization credentials to access the x-function-key which is being passed in request header when you invoke an operation in APIM test console.

• This is how APIM is storing the function key after importing a function app and using it via set-backend-service policy.