question: configure a messageheaderinitializer to apply to the headers of allmessages sent to the client outbound channel . by default this property is not set . concode_field_sep PropertyPlaceholderHelper placeholderHelper concode_elem_sep SimpMessageSendingOperations messagingTemplate concode_elem_sep String defaultDestinationPrefix concode_elem_sep String defaultUserDestinationPrefix concode_elem_sep Map<String,String> vars concode_elem_sep MessageHeaderInitializer headerInitializer concode_elem_sep boolean annotationRequired concode_field_sep void handleReturnValue concode_elem_sep MessageHeaders createHeaders concode_elem_sep String resolvePlaceholder concode_elem_sep String getDefaultUserDestinationPrefix concode_elem_sep void setDefaultDestinationPrefix concode_elem_sep boolean supportsReturnType concode_elem_sep String[] getTargetDestinations concode_elem_sep MessageHeaderInitializer getHeaderInitializer concode_elem_sep PlaceholderResolver initVarResolver concode_elem_sep String getDefaultDestinationPrefix concode_elem_sep String getUserName concode_elem_sep String toString concode_elem_sep void setDefaultUserDestinationPrefix
target: void function ( MessageHeaderInitializer arg0 ) { this . headerInitializer = arg0 ; }