How to implement handshake in an upstream module?

Yichun Zhang (agentzh) agentzh at
Thu Dec 5 21:23:55 UTC 2013


On Wed, Dec 4, 2013 at 10:27 PM, Reetesh Ranjan wrote:
> The handshake, the way it is in my specific case, is logically just an
> extension of the request and response streams. So just merged it into the
> same.
> client                           server
>        handshake . request  --->
>        <--- handshake . response
> So now things fit into the nginx state machine of upstream modules without
> any changes required.

You're essentially doing pipelined requests here and you will run into
the following limitation in the nginx core:

I ran into this when testing my ngx_redis2 module's pipelined request
feature and my patch in that thread will help you :)

Also, you may also want to deal with keepalive connections in your
module in the future and you will want to save the handshake for
reused connections (from the connection pool).


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