SAP API Management - Assign Message Policy

 Scenario: While sending the request, Client sends the search parameter in the form of query but Back-end system excepts it as a header parameter

Sample Request:

<API Proxy URL>?search=Sydney

Steps:

1. Add an instance of Assign Message in Request Path.

2. Modify the policy as per requirement.

In this case, the request is modified as below.

A new header with name 'find' is created using Set operation.

Query Parameter 'search' is deleted using Remove operation.

Code:

<!-- This policy can be used to create or modify the standard HTTP request and response messages -->

<AssignMessage async="false" continueOnError="false" enabled="true" xmlns='http://www.sap.com/apimgmt'>

 

<!-- Sets a new value to the existing parameter -->

<Set>

     <Headers>

         <Header name="find">{request.queryparam.search}</Header>

     </Headers>

</Set>

<Remove>

    <QueryParams>

        <QueryParam name="search"></QueryParam>

    </QueryParams>

</Remove>

<IgnoreUnresolvedVariables>false</IgnoreUnresolvedVariables>

<AssignTo createNew="false" type="request">request</AssignTo>

</AssignMessage>