Because of its ability to communicate with the server, the object XmlHttpRequest (XHR), used in the technology Ajax (which stands for Asynchronous JavaScript and XML, which should be pronounced "egiacs" even if we Italians prefer "aiacs"), has a security lock that prevents you from running applications outside the domain in which it operates. This protection is necessary to prevent Javascript Injection (techniques of "injection" extremely dangerous code in order to break the system) of various kinds, with the ultimate objective of "break" in the system.
This limit is now taken into serious consideration and you're thinking, somehow, to solve it - XmlHttpRequest object directly - without compromising security (see also: Third Proposal for cross-site extensions to XMLHttpRequest ).
However, the situation today is as follows:
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