javascript - A question about cross-domain (subdomain) ajax request

Question

Let's say I have the main page loaded from http://www.example.com/index.html. On that page there is js code that makes an ajax request to http://n1.example.com//echo?message=hello. When the response is received a div on the main page is updated with the response body.

Will that work on all popular browsers?

Edit:

The obvious solution is to put a proxy in front of www.example.com and n1.example.com and set it so that every request going to a subresource of http://www.example.com/n1 gets proxied to http://n1.example.com/.

Answer 1

Cross domain is entirely a different subject. But cross sub-domain is relatively easy. All you need to do is to set the document.domain to be same in both the parent page and the iframe page.

document.domain = "yourdomain.com"

More info here

Note: this technique will only let you interact with iframes from parents of your domain. It does not alter the Origin sent by XMLHttpRequest.