How to handle ETIMEDOUT error?

Question

How to handle etimedout error on this call ?

 var remotePath = "myremoteurltocopy"  var localStream = fs.createWriteStream("myfil");;         var out = request({ uri: remotePath });         out.on('response', function (resp) {             if (resp.statusCode === 200) {                 out.pipe(localStream);                 localStream.on('close', function () {                     copyconcurenceacces--;                     console.log('aftercopy');                     callback(null, localFile);                 });             }             else                 callback(new Error("No file found at given url."), null);         }) 

There are a way to wait for longer? or to request the remote file again?

What exactly can cause this error? Timeout only?

Answer 1

This is caused when your request response is not received in given time(by timeout request module option).

Basically to catch that error first, you need to register a handler on error, so the unhandled error won't be thrown anymore: out.on('error', function (err) { /* handle errors here */ }). Some more explanation here.

In the handler you can check if the error is ETIMEDOUT and apply your own logic: if (err.message.code === 'ETIMEDOUT') { /* apply logic */ }.

If you want to request for the file again, I suggest using node-retry or node-backoff modules. It makes things much simpler.

If you want to wait longer, you can set timeout option of request yourself. You can set it to 0 for no timeout.