Sample Code for checking session token

gistfile1.xml

<flow name="policy.stub">
		<http:listener config-ref="HTTP_Listener_Configuration"
			path="/inbound" doc:name="HTTP" />
		<logger message="#[sessionVars.tokenName]" level="INFO"
			doc:name="Logger" />
		<enricher doc:name="Message Enricher" source="#[payload.isValid]" target="#[flowVars['isValid']]">
			<processor-chain doc:name="Processor Chain">
				<http:request config-ref="HTTP_Request_Configuration"
					path="validate" method="GET" doc:name="HTTP" />
				<json:json-to-object-transformer
					returnClass="java.util.Map" doc:name="JSON to Object" />
			</processor-chain>
		</enricher>

		<choice doc:name="Choice" >
      <when expression="">
          <http:request config-ref="HTTP_Request_Configuration1" path="internal" method="GET" doc:name="HTTP"/>
      </when>
      <otherwise>
        <logger message="Token not valid. Generate error codes!" level="INFO" doc:name="Logger"/>
      </otherwise>
    </choice>
</flow>