Best practice on return values from module that handles http

gistfile1.js

var myModule = require('myModule');

myModule.fetch('some/url', function (err, val) {
	//if 'some/url' cannot be found what should myModule return?
	//some options I can think of
	
	//#1
	//err => null
	//val => 404
	
	//#2
	//err => 404
	//val => null
	
	//#3
	//err => A proper JS Error
	//val => null
});

#3, 404 status in error object

if you are looking for a 1, 2, or 3... i'm inclined to say 3, because of the fs api... even if the filesystem (read: http) is working properly, a missing file results in an error.

if you are looking for "best practice" however, the http.get api returns an object that you can then .on('error', function (err) {});