Flow chart:
A (HTTP client access) - B (middle) - C (third party sites)

A login by B C

ABC is such a process, here must be kept in a link, any one is broken, is a new session, a new session will again get the verification code, then verified, then send the login data (this time it is a new session), so not

Don't know I clearly didn't again,

I look at the inside DataSnap use HTTP connection, should be a short connection, test, function could not reach the requirements of I, everyone is there good way or opinions, I thank you all here,