Assign Attributes Policy

The assign-attributes policy sets variables such as request attributes, message attributes and other execution context attributes.

You can use it to retrieve initial request attributes after Transform headers or Transform query parameters policies and reuse them in other policies (Dynamic routing, for example).

Timing

On Request	On Response	On Request Content	On Response Content
X	X	X	X

Configuration

Property	Required	Description	Type	Default
scope	no	The execution scope (REQUEST, RESPONSE, REQUEST_CONTENT, RESPONSE_CONTENT).	string	REQUEST
attributes	yes	List of attributes. See below.

Attributes

Property	Required	Description	Type	Default
name	yes	Attribute name.	string
value	yes	Attribute value (can be EL)	string

Examples

Request header Inject request attributes into the context attributes:

"assign-attributes": {
    "attributes": [
        {
            "name": "initialContentTypeHeader,
            "value": "{#request.headers['Content-Type']}"
        },
        {
            "name": "initialFooParamHeader,
            "value": "{#request.params['foo']}"
        }
    ]
}

To extract the request attributes you can use the following syntax:

Get the content-type header:

{#context.attributes['initialRequest'].headers['content-type']}

Get the foo query param:

{#context.attributes['initialRequest'].params['foo']}

Errors

HTTP status code

Code	Message
500	An error occurred while setting request attributes in the execution context.