Improve error message on not 2xx code

Closes #38

index.js

@@ -11,6 +11,7 @@ var read = require('read-all-stream');
 var timeout = require('timed-out');
 var prependHttp = require('prepend-http');
 var lowercaseKeys = require('lowercase-keys');
+var status = require('statuses');
 
 function got(url, opts, cb) {
 	if (typeof opts === 'function') {
@@ -65,7 +66,7 @@ function got(url, opts, cb) {
 			var res = response;
 
 			// redirect
-			if (statusCode >= 300 && statusCode < 400 && 'location' in res.headers) {
+			if (status.redirect[statusCode] && 'location' in res.headers) {
 				res.resume(); // Discard response
 
 				if (++redirectCount > 10) {
@@ -85,7 +86,7 @@ function got(url, opts, cb) {
 
 			if (statusCode < 200 || statusCode > 299) {
 				read(res, encoding, function (error, data) {
-					var err = error || new Error('Couldn\'t connect to ' + url + '.');
+					var err = error || new Error(url + ' response code is ' + statusCode + ' (' + status[statusCode] + ')');
 					err.code = statusCode;
 					cb(err, data, response);
 				});

package.json

@@ -45,6 +45,7 @@
     "object-assign": "^2.0.0",
     "prepend-http": "^1.0.0",
     "read-all-stream": "^1.0.0",
+    "statuses": "^1.2.1",
     "timed-out": "^2.0.0"
   },
   "devDependencies": {

test/test-error.js

@@ -0,0 +1,29 @@
+'use strict';
+var tape = require('tape');
+var got = require('../');
+var server = require('./server.js');
+var s = server.createServer();
+
+s.on('/', function (req, res) {
+	res.statusCode = 404;
+	res.end('not');
+});
+
+tape('setup', function (t) {
+	s.listen(s.port, function () {
+		t.end();
+	});
+});
+
+tape('error message', function (t) {
+	got(s.url, function (err) {
+		t.ok(err);
+		t.equal(err.message, 'http://localhost:6767 response code is 404 (Not Found)');
+		t.end();
+	});
+});
+
+tape('cleanup', function (t) {
+	s.close();
+	t.end();
+});