Remove the payload and send POST request to backend via wso2 esb

There are situations where back-end does not need a payload for POST request. However in wso2 ESB has the payload that mediate before the back-end call. In order to drop the message payload you need to perform two tasks in the wso2 ESB.

• Create empty payload using Payload mediator
• use the FORCE_POST_PUT_NOBODY property to enforce.

Example is given below that demonstrate the use case. 

	<api xmlns="http://ws.apache.org/ns/synapse" name="strip" context="/strip">
	<resource methods="POST GET">
	<inSequence>
	<header name="Authorization" scope="transport" value="Bearer XXXXXXXXXXXXXXXXXXXXX"></header>
	<property name="uri.var.chargeId" expression="json-eval($.chargeId)" scope="default" type="STRING"></property>
	<payloadFactory media-type="json">
	<format></format>
	<args></args>
	</payloadFactory>
	<property name="ContentType" value="application/x-www-form-urlencoded" scope="axis2"></property>
	<property name="messageType" value="application/x-www-form-urlencoded" scope="axis2"></property>
	<property name="FORCE_POST_PUT_NOBODY" value="true" scope="axis2" type="BOOLEAN"></property>
	<call>
	<endpoint>
	<address uri="https://api.stripe.com/v1/charges/{uri.var.chargeId}/refunds"></address>
	</endpoint>
	</call>
	<respond></respond>
	</inSequence>
	</resource>
	</api>

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