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From MAC OS you can do this from the terminal line: The code that does the downloading - your html script tag or xhr from javascript or whatever - came from, let's say, Z. It means, Only site B is allowed to do this request.

If you want just to test a cross domain application in which the browser blocks your request, then you can just open your browser in unsafe mode and test your application without changing your code and without making your code unsafe.CORS relaxes the same origin policy for domain, using the header to list other domains (domain that are trusted to run Java Script that can interact with domain To understand which domain should serve the CORS headers, consider this.In other words, a non-simple request whose preflight is successful is treated the same as a simple request (i.e., the server must still send (A. In the past developers created many tricky ways to achieve Cross-Domain resource request, most commonly using ways are: Those tricky ways have more or less some issues, for example JSONP might result in security hole if developers simply "eval" it, and #3 above, although it works, both domains should build strict contract between each other, it neither flexible nor elegant IMHO:) W3C had introduced Cross-Origin Resource Sharing (CORS) as a standard solution to provide a safe, flexible and a recommended standard way to solve this issue.The Mechanism From a high level we can simply deem CORS is a contract between client AJAX call from domain A and a page hosted on domain B, a typical Cross-Origin request/response would be: Domain A AJAX request headers Host Domain User-Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0 Accept text/html,application/xhtml xml,application/xml;q=0.9,*/*;q=0.8,application/json Accept-Language en-us; Accept-Encoding gzip, deflate Keep-Alive 115 Origin The blue parts I marked above were the kernal facts, "Origin" request header "indicates where the cross-origin request or preflight request originates from", the "Access-Control-Allow-Origin" response header indicates this page allows remote request from Domain A (if the value is * indicate allows remote requests from any domain).

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