public RouteBuilder consumes(MediaType... consumeTypes) {
        consumes(ImmutableSet.copyOf(requireNonNull(consumeTypes, "consumeTypes")));
        return this;
    }
Sets the {@link Route} to consume the specified {@link MediaType}s. If not set,
the mapped {@link HttpService} accepts {@link HttpRequest}s that have any
{@link HttpHeaderNames#CONTENT_TYPE}. In order to get this work, {@link #methods(Iterable)} must be set.
core/src/main/java/com/linecorp/armeria/server/RouteBuilder.java