Azure APIM - Policy - Set-Body - System.DateTime.UtcNow not retrieved

Question

Hi

I'm using the Set-body policy to set some attributes
One of them needs to have he datetime of the operation

The operation runs well but the

• UpdatedDateTime attribute always gets an empty string

. what is wrong on my C# expression?

    <set-body template="liquid">  
    {  
    "UpdatedBy": "{<!-- -->{context.Request.Headers["ocp-apim-subscription-key"]}}",  
    **"UpdatedDateTime": "{{System.DateTime.UtcNow.ToString()}}"**  
    {%if  body.displayName %} ,"displayName":"{{body.displayName}}" {% endif %}  
    }     
    </set-body>  

Many thanks,
JD

Answer 1

@juni dev Thank you for reaching out to Microsoft Q&A. Using liquid template, you can access request, response information along with context object. But you cannot evaluate policy expression like above. Alternatively, you can set policy expression value in variable, and then you can access it like below:

<set-variable name="UpdatedDateTime" value="@(System.DateTime.UtcNow.ToString())" />  
        <set-body template="liquid">  
			"UpdatedBy": "{{context.Request.Headers["ocp-apim-subscription-key"]}}",  
            "UpdatedDateTime": "{{context.Variables["UpdatedDateTime"]}}"  
            {%if  body.displayName %} ,"displayName":"{{body.displayName}}" {% endif %}  
</set-body>  

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