The previous version of reCAPTCHA provided the option to make a global key which would work on any domain. Now, in version 2, that option is gone, and the reCAPTCHA site claims that "Global Keys are not supported in the V2 API."The previous version of reCAPTCHA provided the
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如何在大量域上使用reCAPTCHA v2？
来源：互联网
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