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I’ve been getting a lot of 404 errors on my site for /crossdomain.xml. What is the most basic example of a file that blocks all cross domain requests? Is a blank file the same as explicitly blocking all cross domain requests?
It’s not necessary to make a crossdomain policy file. Websites must explicitly allow Flash via crossdomain policy, or it is completely blocked.
The
/crossdomain.xmlrequest you see is automatically performed by Flash when it tries to access a URL on your site.