code: @GET
      @Produces("application/json")
      public GenericEntity<List<ChannelInformation>> listChannels() {
          try {
              return new GenericEntity<List<ChannelInformation>>(channelService.listChannels()) {
              };
          } catch (Exception e) {
              log.error("GET channels listChannels: error: {}", e.getMessage(), e);
              throw new WebApplicationException(Status.INTERNAL_SERVER_ERROR);
          }
      }
docs: A simple HTML list view of channels. A JSP is used for rendering.
  
  @return a HTML list of available channels, and their resources (long poll
  connections) if connected.