http2session.originSet
如果 Http2Session 连接到 TLSSocket，则 originSet 属性将返回 Array 的起源，Http2Session 可能被认为是权威的。
¥If the Http2Session is connected to a TLSSocket, the originSet property
will return an Array of origins for which the Http2Session may be
considered authoritative.
originSet 属性仅在使用安全 TLS 连接时可用。
¥The originSet property is only available when using a secure TLS connection.