docs: @Override
      public void addTo(CommandContext ctx, ModelNode headers) throws CommandFormatException {
          if(name == null) {
              throw new CommandFormatException("Header name is null.");
          }
          if(value == null) {
              throw new CommandFormatException("Value for header '" + name + "' is null.");
          }
          headers.get(name).set(value);
      }