node.js - Check if URL would result in getaddrinfo error -

is there way check if given address result in getaddrinfo error when request made? have list of urls , of them causes getaddrinfo error , crashs node.js app. check if address can resolved before call request method. have been trying catch error inside callback function of request without luck. thanks!

this attempt - ref = this;

var options = {     host: ref.host,     headers: {         'user-agent': 'mozilla/5.0'           },     path: ref.pathname,     method: "get",     timeout: 5000,     followredirect: true,     maxredirects: 5 };    // process file. var file = fs.createwritestream(path.normalize(ref.saveto + ref.name + ref.extension));  var req = ref.protocol.get(options, function(res) {             res.on('data', function(data) {               f.write(data);     }).on('end', function() {         f.end();     }); });  req.on('response', function(err) {   if(err.statuscode == '404') {      console.log("response ", err);   } });   req.on('error', function(err) {   console.log("this error ----" + err); }); req.end(); 

edit : error node.js -

error: getaddrinfo enotfound @ errnoexception (dns.js:37:11) @ object.onanswer [as oncomplete] (dns.js:124:16)

you can catch error event on http request. example:

var dogetrequest = require("http").get; var req = dogetrequest("http://foo.bar", function(res) {  }); req.on("error", function errorhandler(err) {     if(err.code === "enotfound") {         console.log("address not found.", e);     } else {         console.log("some other error:", e);     } }); 

the reason why event used , not exception because hostname lookup asynchronous. not sure why don't pass first parameter callback, that's way things are.