Cannot send HTTP headers with Camel URI binding + Camel-HTTP in SwitchYard

Issue

• One of the external web service calls needs a session token and other dynamic parameters to be appended as query string to WS URL.
• The HTTP proxy approach described in this solution -- How to switch SOAP endpoints dynamically at runtime for SOAP reference bindings in SwitchYard -- was used for implementing a dynamic endpoint in SOAP request using Camel URI binding and Camel HTTP component.
• However, HTTP headers in a SwitchYard request miss a few items like "SOAPAction", "Content-Type", "Accept-Encoding", etc. when compared with SoapUI, hence the call fails.

• Here is part of the switchyard.xml:

  <camel_1:binding.uri name="Camel2" configURI="http://www.example.com/ws/myservice">
    <camel_1:contextMapper includes="CamelHttp.*"></camel_1:contextMapper>
  </camel_1:binding.uri>
  

• The Camel route (Java DSL):

  exchange.getOut().setHeader(Exchange.SOAP_ACTION, "doThis");
  exchange.getOut().setHeader(Exchange.CONTENT_TYPE, "application/soap+xml;charset=UTF-8;action=\"doThis\"");