这是最隐蔽的坑！因为多个虚拟线程会共享同一个载体线程，而 ThreadLocal 的数据是绑定到线程本身的（即载体线程）。如果在虚拟线程里用 ThreadLocal 存数据（比如当前登录用户），可能出现 A 虚拟线程存的数据被 B 虚拟线程读走的情况。
A rough picture of a zero-knowledge-based credential system. Here the driver’s license is a structured document that the Issuer signs and sends over. The “Show” involves creating a non-interactive ZK proof (NIZK) that the User can send to the Resource. Generally this will be structured so that it’s bound to the specific Resource and sometimes a nonce, to prevent it from being replayed. (License icon: Joshua Goupil.)，推荐阅读体育直播获取更多信息
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