Azure API 管理 - 液体转换不再起作用

Question

I have several operations in Azure API Management which uses the liquid template. A few weeks ago I recognized that existing liquid templates stopped working.

Did I something wrong? Is there an issue with API Management?
Based on the documentation I'm not able to find any errors.

Therefore I created a basic example that does not transform the request body.

Policy:

    <policies>
        <inbound>
            <base />
            <return-response>
                <set-status code="200" reason="OK" />
                <set-body template="liquid">
                    {   
                    "email":"{{body.EmailAddress}}"
                    }
                </set-body>
            </return-response>
        </inbound>
        <backend>
            <base />
        </backend>
        <outbound>
            <base />
        </outbound>
        <on-error>
            <base />
        </on-error>
    </policies>

Request:

POST https://hidden.azure-api.net/evaluation/mm/liquid HTTP/1.1
Host: hidden.azure-api.net
Ocp-Apim-Subscription-Key: ••••••••••••••••••••••••••••••••

{
    "EmailAddress": "sample@lorem.ipsum"
}

Response:

HTTP/1.1 200 OK

content-length: 79
date: Wed, 10 Feb 2021 07:50:53 GMT
vary: Origin

{   
   "email":""
}

My expectation is transformed body:

{   
   "email":"sample@lorem.ipsum"
}

Answer 1

Have you tried adding the Content-Type: application/json header to your request? Liquid only works if the content type is set, else it couldn't know how to parse the document properly.

Answer 2

Microsoft Support informed me that the set-body policy with liquid template is not supported in return-response policy.