==== Setting headers on messages

Messages sent over the event bus can also contain headers. This can be specified by providing a
`link:../../apidocs/io/vertx/core/eventbus/DeliveryOptions.html[DeliveryOptions]` when sending or publishing:

[source,java]
----
DeliveryOptions options = new DeliveryOptions();
options.addHeader("some-header", "some-value");
eventBus.send("news.uk.sport", "Yay! Someone kicked a ball", options);
----