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我想验证呼叫并可能在服务器拦截器中回答错误。有没有办法做到这一点？如果是，我该如何实现？
简单地从拦截器响应 RPC，可能通过调用close()，而不是调用next. 您仍然需要返回一个侦听器，但这可以简单地是new ServerCall.Listener() {}.
close()
next
new ServerCall.Listener() {}