Proxy Broadcast Example

[cmazakas]

From slack:

the protocol is
request: uint32_t key
response: uint32_t key, uint32_t value
the server has one connection C0 to another server endpoint, and C1...Cn client connections
when a client Ci sends a request, the server forwards it to C0, then forwards the response back to Ci
this can work with both half duplex and full duplex, and the two are both interesting cases