Assign Content Policy

The assign-content policy changes or transforms the content of the request/response body or message.

This policy is compatible with the Freemarker template engine, which allows you to apply complex transformations, such as transforming from XML to JSON and JSON to XML.

By default, you can access multiple objects from the template context — request and response bodies, dictionaries, context attributes, and more.

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

Configuration

Property	Required	Description	Type	Default
scope	yes	The execution scope of the policy.	scope	REQUEST
body	yes	The data to push as request or response body content.	string

 "policy-assign-content": {
    "scope":"REQUEST",
    "body":"Put your content here"
}

Examples

Example of Request body built from header:

"configuration": {
   "scope": "REQUEST",
   "body": "Request body built from header 'requestHeader' and content: ${request.headers['requestHeader'][0]}"
}

Policy example to transform response from JSON to XML

Incoming response body content:

{
  "id": 4,
  "first_name": "Fiona",
  "last_name": "Noirel",
  "email": "fnoirel@example.edu",
  "gender": "Male"
}

configuration scope: RESPONSE

configuration body:

<#assign body = response.content?eval>
<?xml version='1.0' encoding='UTF-8'?>
<dataset>
    <record>
        <id>${body.id}</id>
        <first_name>${body.first_name}</first_name>
        <last_name>${body.last_name}</last_name>
        <email>${body.email}</email>
        <gender>${body.gender}</gender>
    </record>
</dataset>

Expected output:

<?xml version='1.0' encoding='UTF-8'?>
<dataset>
    <record>
        <id>4</id>
        <first_name>Fiona</first_name>
        <last_name>Noirel</last_name>
        <email>fnoirel@example.edu</email>
        <gender>Male</gender>
    </record>
</dataset>

Errors

HTTP status code

Code	Message
500	The body content cannot be transformed