This is a working example/proof-of-concept that shows how to use soheilhy's excellent cmux package (cockroachdb's fork is used here).
This example covers a very specific use-case, as per release blog post; for more use-cases give a look to the examples in cmux' GoDocs.
For upstream discussion, see grpc/grpc-go#549.
GNU GPL version 2 The greeter client side example is covered by a different BSD-style license (see greeter_client.go).
This project uses an automatically-provisioned GOPATH. Example init/building commands on a Linux system:
git submodule update --init --recursive
make
Start the server-side in a terminal:
$ bin/greeter_multiplex_server
2016/08/27 16:20:21 listening and serving (multiplexed) on :50051
Make a gRPC test in another terminal with:
$ bin/greeter_client
2016/08/27 16:21:47 Greeting: Hello world
Test a status call (for example, as load-balancers would do) by fetching /status:
$ curl -v http://localhost:50051/status
* Hostname was NOT found in DNS cache
* Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 50051 (#0)
> GET /status HTTP/1.1
> User-Agent: curl/7.50.1
> Host: localhost:50051
> Accept: */*
>
< HTTP/1.1 200 OK
< Date: Sat, 27 Aug 2016 14:24:02 GMT
< Content-Length: 2
< Content-Type: text/plain; charset=utf-8
<
* Connection #0 to host localhost left intact
OK
And browse any other URL (via browser) to see normal HTML output:
$ curl http://localhost:50051/xxx
Welcome to the home page!