We support the entire evolution of the protocol: from Google’s original specification, through all fifteen IETF drafts – that’s sixteen versions. That means we have conditional logic littered throughout the codebase: version tags, padding schemes, tag labels, hash sizes, and packet layouts all vary with the protocol version. In several places, compatibility won over elegance or optimization.
OTA中介地位就此落寞？OTA平台在一定程度上解决了信息不对称问题，同时提供售后与纠纷协调机制，成为消费者与商家之间的重要“信任中介”。
。17c 一起草官网对此有专业解读
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