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Message Part Identifier allows policies to identify the part of the message from where the values required for various policies needs to be populated from. For example, to perform Response Cache based on a query parameter, the key in the policy can be configured as Query Parameter such as ID. 


Figure 1: Dialog box to choose Identifier Type

Type

Various types of message parts are:

  • Context Variable
  • Parameter
  • Header
  • Constant

Each Message Part type is explained below.

Context Variable

The name can be one of the Context variables defined in Context Variables section or any variable defined using the Assign Variables Policy.


Figure 2: Context Variable Identifier type with list of Variable names

Parameter

The name of the query parameter which needs to be used as the identifier.


Figure 3: Parameter Identifier type with the corresponding attributes

Header

The name of the Header which needs to be used as the identifier.


Figure 4: Header Identifier type with the corresponding attributes

Constant

This option can be used to define constants as variable. For Example, value of weight in Quota Policy.


Figure 5: Constant Identifier type with the corresponding attributes

Default Value

The default value is used when the identifier specified is not present in the incoming message. For example, the variable api.product.name will not be present unless Verify API Key or OAuth Token End Point is used.

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For the Types: 'Parameter' and 'Header', you need to provide the attributes—Name and Default Value, and for Constant provide just the Default value

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