| /** | |
| * Module dependencies. | |
| */ | |
| var dns = require('dns'); | |
| /** | |
| * Module exports. | |
| */ | |
| module.exports = isResolvable; | |
| isResolvable.async = true; | |
| /** | |
| * Tries to resolve the hostname. Returns true if succeeds. | |
| * | |
| * @param {String} host is the hostname from the URL. | |
| * @return {Boolean} | |
| */ | |
| function isResolvable (host, fn) { | |
| var family = 4; | |
| dns.lookup(host, family, function (err, ip) { | |
| fn(null, !err); | |
| }); | |
| } |