code: function performGssapiCanonicalizeHostName(canonicalizeHostName, host, callback) {
        if (!canonicalizeHostName) return callback();
  
        // Attempt to resolve the host name
        dns.resolveCname(host, (err, r) => {
          if (err) return callback(err);
  
          // Get the first resolve host id
          if (Array.isArray(r) && r.length > 0) {
            self.host = r[0];
          }
  
          callback();
        });
      }
docs: Canonicialize host name if needed