This is done using a cross-domain policy file.

这可以用跨域策略文件完成。

youdao

The domain is optional, only required if you need to perform cross-domain authentication.

域是可选的，只有在您需要执行跨域的验证时才需要。

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The trap here is in failing to recognize that cross-domain authentication is taking place.

在这种情况下，验证失败的原因是发生了跨域身份验证。

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More so, the challenge remains on a cross-national domain level of what regulatory and compliance environments even exist.

FORBES: Technological Risks Impacting the World in 2013