CORS Questions

• From: Nathan <nathan@webr3.org>
• Date: Mon, 10 May 2010 23:42:21 +0100
• To: public-webapps@w3.org
• CC: Anne van Kesteren <annevk@opera.com>
• Message-ID: <4BE88BCD.6070300@webr3.org>

Hi All,

A couple of questions about CORS.


1: Why is CORS an opt-out setup instead of an opt-in?
eg why are all my resource hidden to js by default rather than exposed, 
then allowing me to limit access to specific resources at my discretion.


2: Why does CORS prevent this:

function doNastyStuff() {
	new client = new XMLHttpRequest();
	client.open("GET", "intranet.corp.example/sensitive.json");
}

but allow this:

function doNastyStuff() {
	var script = document.createElement("script");
	script.src = 'intranet.corp.example/sensitive.json';
	document.body.appendChild(script);
}


Best,

Nathan

Received on Monday, 10 May 2010 22:43:35 UTC