'set-variable' Statement to Create Custom Variables


How to use the "set-variable" Policy Statement to create custom variables for an Azure API service operation?

✍: FYIcenter.com


The "set-variable" policy statement allows you to create custom variables with given values to be used later in other policy statements.

The "set-variable" statement has the following syntax:

<set-variable name="variable_name" value="Expression | Text" /> 

If a "@(...)" expression is used, the variable have hold the objects returned from the expression in a number of C# types, like System.Boolean, System.Int32, System.Single, System.Double, System.String, System.DateTime, etc.

For example, the following inbound policy creates three variables: the first one with a text as its value; the second one with a "@(...)" expression returning a Boolean; the third one with a "@(...)" expression returning a String;

    <set-variable name="version" value="1.11"/>
    <set-variable name="isMobile" 
    <set-variable name="method" value="@(context.Request.Method)"/>

For more information on "set-variable" statement, see API Management policy expressions Website.


Use Custom Variables in Policy Expressions

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Using Azure API Policy

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2018-01-24, 10348🔥, 0💬