Used by a kex obj to register the next packet type it expects to see.

Return the next channel opened by the client over this transport, in server mode. If no channel is opened before the given timeout,

Authenticate to the server interactively. A handler is used to answer arbitrary questions from the server. On many servers, this is

Return a `.SecurityOptions` object which can be used to tweak the encryption algorithms this transport will permit (for encryption,

return list ，every folder will endwith /

domain :like x.y.z ,x,y,z length should be < 64, and total length (x.y.z) <255

Return true if this session is active and authenticated. :return: True if the session is still open and has been authent

status [0,1] 0:状态正常 1:状态异常

This method will split the HTTP response body by various separators, such as new lines, tabs, <, double and single quotes. This method i