from("direct:start")
   .setHeader(Exchange.HTTP_QUERY,constant("USERNAME=__&PASSWORD=__"))
   .to("https4://someAddress.com/api/controls/uploadAndImportFileFromCSV")
   .to("stream:out");

org.apache.camel.CamelExecutionException: Exception occurred during execution on the exchange: Exchange[ID-rajat-Lenovo-G50-70-1513247400372-0-1]
org.apache.camel.util.ObjectHelper.wrapCamelExecutionException(ObjectHelper.java:1847)
.........
Caused by: org.apache.camel.http.common.HttpOperationFailedException: HTTP operation failed invoking https4://someAddress.com/api/controls/uploadAndImportFileFromCSV?USERNAME=__&PASSWORD=__ with statusCode: 599