How can a custom header be added to the MarshallingWebServiceOutboundGateway in SI?

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To add a custom header to the MarshallingWebServiceOutboundGateway in Spring Integration, you can use the HeaderEnricher component. The HeaderEnricher allows you to add, modify or remove headers of a message.

Here is an example configuration:

<int:header-enricher input-channel="enrichChannel" output-channel="outboundChannel">
    <int:header name="Custom-Header" value="customValue"/>
</int:header-enricher>

<int-ws:marshaller id="marshaller" />

<int-ws:outbound-gateway uri="http://example.com"
                         marshaller="marshaller"
                         expected-response-type="java.lang.String"
                         reply-channel="responseChannel">
    <int-ws:request-handler-advice-chain>
        <ref bean="retryAdvice" />
    </int-ws:request-handler-advice-chain>
</int-ws:outbound-gateway>

In this configuration:

• The HeaderEnricher component is used to add the custom header "Custom-Header" with the value "customValue" to the message.
• The message is sent to the MarshallingWebServiceOutboundGateway for outbound communication. The reply-channel is set to "responseChannel".
• A request-handler-advice-chain is added, which can be used to add additional behavior to the outbound gateway. In this example, the retryAdvice is used to retry the outbound call in case of failures.

With this configuration, the custom header will be added to the message sent to the web service.