hash of the payload of all handshake records (type=0x16) previous to this one.
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，更多细节参见safew官方版本下载
wait_for_not_none is particularly useful since we love type safety:。一键获取谷歌浏览器下载对此有专业解读
Sarah has worked as a reporter for TechCrunch since August 2011. She joined the company after having previously spent over three years at ReadWriteWeb. Prior to her work as a reporter, Sarah worked in I.T. across a number of industries, including banking, retail and software.