http get NodeJS how to get error status code?

Question

OK, I must be dense since I cannot find anywhere how to get the error status codes when using Node.JS http.get or http.request.

My code:

var deferred = $q.defer(); var req = https.get(options, function(response) {   var str = '';   response.on('data', function(chunk) {     str += chunk;   });   response.on('end', function() {     console.log("[evfService] Got user info: " + str);     deferred.resolve(str);   }); });  req.on('error', function(e) {   deferred.reject(e); }); 

In that "req.on" bit, what I want is the http status code (i.e. 401, 403, etc.). What I get is a semi-useless error object that does not give me the code or any reference to the response object.

I have tried intercepting in the function(response) callback, but when there is a 404, it never gets called.

Thanks!

Answer 1

Your callback gets called regardless of the response status code from the server, so within your callback, check response.statusCode. That is, a 4xx status code isn't an error at the level you're working at; the server responded, it's just that the server responded by saying the resource wasn't available (etc.)

This is in the documentation but characteristically vague. Here's the example they give, with a comment pointing to the relevant bit:

var https = require('https');  https.get('https://encrypted.google.com/', function(res) {   console.log("statusCode: ", res.statusCode); // <======= Here's the status code   console.log("headers: ", res.headers);    res.on('data', function(d) {     process.stdout.write(d);   });  }).on('error', function(e) {   console.error(e); }); 

If you try that with (say) an unknown resource, you'll see statusCode: 404.

So for what you're doing, you may want something like this:

var deferred = $q.defer();  var req = https.get(options, function (response) {     var str = "";      if (response.statusCode < 200 || response.statusCode > 299) { // (I don"t know if the 3xx responses come here, if so you"ll want to handle them appropriately         response.on("data", function() { } ); // ¹         deferred.reject(/*...with appropriate information, including statusCode if you like...*/);     }     else {         response.on("data", function (chunk) {             str += chunk;         });         response.on("end", function () {             console.log("[evfService] Got user info: " + str);             deferred.resolve(str);         });     } });  req.on("error", function (e) {     deferred.reject(/*...with appropriate information, but status code is irrelevant [there isn"t one]...*/); }); 

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¹ The empty data event handler in the branch handling non-OK status codes is there because of this note in the documentation:

...if a 'response' event handler is added, then the data from the response object must be consumed, either by calling response.read() whenever there is a 'readable' event, or by adding a 'data' handler, or by calling the .resume() method. Until the data is consumed, the 'end' event will not fire. Also, until the data is read it will consume memory that can eventually lead to a 'process out of memory' error.

Since we're passing a function to https.get, we're hooking the 'response' event, which suggests we need to do one of those things (in this case, I've added a do-nothing data handler). Thanks to Nicolas2bert for pointing that out!.

Answer 2

An error code 400 response is not considered an error by node.js.

Try response.statusCode in this:

request.on('response', function (response) {});