docs: function showSpecifications(options , callback){
      options.url  = 'https://'+options.host+':'+options.port+SUPERVISOR_PATH_SHOW_SPECIFICATION;
      options.ca = ssl_files.readCaChain(options.caFile);
      options.key = ssl_files.readFileContent(options.keyFile);
      options.cert = ssl_files.readFileContent(options.certFile);
  
      request(options, function (error, response, body) {
          if (!error && (response.statusCode == 200)) {
              var spec = (JSON.parse(body));
                  callback(null , spec);
          }else{
              callback(new Error("Error connecting to the supervisor") , null);
          }
      });
  }