Support RTMP source penetration authentication

[winlinvip]

https://github.com/winlinvip/simple-rtmp-server/issues/104

TRANS_BY_GPT3

[walkermi]

@winlinvip Many of the old issue links are no longer valid, what a pity!

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[winlinvip]

Hehe, you can check WIKI, RTMP back-to-origin penetration authentication means that the edge will authenticate each connection back to the origin once.
Actually, this authentication is more suitable to be implemented with HTTP callback.

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[winlinvip]

It's better to use HTTP Callback for auth.