Exception handler in Node.js

Question

I have a very simple question; I have a wrong endpoint and when I try the following code, it throws an exception

client.post("http://WrongEndPoint", [], function (data, response) {
    console.log("data:", data, "response:", response.statusCode);
})

ERROR:

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: connect ETIMEDOUT
    at errnoException (net.js:905:11)
    at Object.afterConnect [as oncomplete] (net.js:896:19)

So I try exception handler, but it is still not handeling the exception and I get the same exception:

try {
    client.post("http://WrongEndPoint", [], function (data, response) {
        console.log("data:", data, "response:", response.statusCode);
    })
} catch (e) {
    console.log("Error:", e)
}

Why can't I still handle the exception?

The error is thrown asynchrously. You'll need to check the docs of that function you're using on whether and how you can catch it (typically in a callback). — Bergi
– Bergi, Commented Jun 16, 2015 at 20:38

Andrew K · Accepted Answer · 2015-06-16 20:37:12Z

1

JavaScript try/catch statement will not work in this case cause this operation performs asynchronously:

client.post("http://WrongEndPoint", [], function (data, response) {
    console.log("data:", data, "response:", response.statusCode);
});

To catch it you should use approach like this

client.post("http://WrongEndPoint", [], function (data, response) {
    console.log("data:", data, "response:", response.statusCode);
}).on('error', function(err){  console.log(err); });

But I'm not sure if it is correct cause I need to know which library do you use.

answered Jun 16, 2015 at 20:37

Andrew K

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1 Comment

user385729 Over a year ago

it is node-rest-client

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