In my application I would like to use a single socket to execute multiple http 
requests between the client and server, but using a multiplexing implementation 
that is not the standard HTTP one.

Looking at the source code it appears that libcurl retrains full control on the 
read and write operations to the socket. Am I missing any alternative that 
would allow me to gain control of the read and write operations to the socket 
so that I can add the control bytes required by my multiplexing implementation?

In case I would try to develop a patch that would allow supporting my scenario, 
which would be the best way to implement it? I was thinking about the 
capability of registering callbacks for the socket recv and send operations, as 
it is currently possible for socket open, close and sockopt. The limitation of 
this approach would be that it would work just for some protocols: for example 
https delegates the read and write to the socket to the ssl library (for 
example openssl) or the ldap protocol uses the ldap functions. Anyhow it would 
work for the plain http protocol. Any other alternative?

Regards,
Bernardo
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