code: @GET
    @Path("/check")
    @Produces(APPLICATION_JSON)
    @Timed
    @ExceptionMetered
    public VersionCheckResponse versionCheck(
        @QueryParam("client") @DefaultValue("") final String client) {
      final PomVersion serverVersion = PomVersion.parse(Version.POM_VERSION);
      final VersionCompatibility.Status status;
  
      if (isNullOrEmpty(client)) {
        return new VersionCheckResponse(VersionCompatibility.Status.MISSING,
            serverVersion, Version.RECOMMENDED_VERSION);
      }
  
      final PomVersion clientVersion = PomVersion.parse(client);
      status = VersionCompatibility.getStatus(serverVersion, clientVersion);
      return new VersionCheckResponse(status, serverVersion, Version.RECOMMENDED_VERSION);
    }
docs: Given the client version, returns the version status, i.e. whether or not they should be
  compatible or not.
  
  @param client The client version.
  
  @return The VersionCheckResponse object.