@POST
  @Path("/concat/generate-link")
  @Consumes(MediaType.APPLICATION_JSON)
  @Produces(MediaType.APPLICATION_JSON)
  public Response concatGenerateLink(final DownloadRequest request) {
    LOG.info("Starting link generation for concat");
    return generateLink(request);
  }
Generate link for concat
@param request download request
@return response wth request id
@see #concatByRequestId(String)
contrib/views/files/src/main/java/org/apache/ambari/view/filebrowser/DownloadService.java