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Benefit of CORS over cross,[link widoczny dla zalogowanych]
CORS is for ajax requests or flash requests that flash wouldn't normally allow. For example,[link widoczny dla zalogowanych], if there is no cross-domain policy for domain x,[link widoczny dla zalogowanych], and you retrieve an mp3 file from there via flash for playback,[link widoczny dla zalogowanych], flash will not allow you to read the id3 tags of the mp3 file. For ajax,[link widoczny dla zalogowanych], you flat out cannot make the request if the target server doesn't have a cross-domain policy that allows your domain to make requests.
Cross-domain messaging allows you to communicate with an iframe in the document that is from different origin. For example,[link widoczny dla zalogowanych], if you have youtube video iframe,[link widoczny dla zalogowanych], you may pass a message to that iframe to change volume. Normally no communication wouldn't be possible because the iframe has a different origin,[link widoczny dla zalogowanych], so you could not do anything with the youtube iframe programmatically.
The reasons to use one or another,[link widoczny dla zalogowanych], should be now clear. CORS allows you to request data from another origin while message passing between main window and an iframe is used when you want to communicate with an app that is inside the iframe but is not in the same origin.
First of all you should be aware that CORS is supported by the following browsers: Internet Explorer 8+,[link widoczny dla zalogowanych], Firefox 3.5+,[link widoczny dla zalogowanych], Safari 4+,[link widoczny dla zalogowanych], and Chrome. Please note that IE7 and older versions of Firefox and Safari doesn't support it at all. But event IE8 has some limitations - it doesn't support credentials and "preflight" requests to be sent to the server.
Cross-domain messaging by using JSONP or iFrames are more universal in terms of browser support and sometimes even doesn't require extra server-side work,[link widoczny dla zalogowanych].相关的主题文章：


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