81bfaeb8a9
https://jira.springsource.org/browse/INT-3002 The AMQP outbound endpoint behaves differently when configured as a gateway compared to when it is configured an adapter. With the adapter, the header mapper is invoked after the message converter (via the MPP callback). With the gateway, the mapper is invoked before the converter. The SimpleMessageConverter unconditionally sets the content-type, overriding any mapped content type. Change the code to invoke the header mapper after the converter to match the adapter logic. Remove the TODO. The method now exists, but Using a MPP in the gateway case does not provide access to headers on the reply. Add test cases.
Spring Integration
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