panic: net/http: CloseNotify called after ServeHTTP finished

[diogomonica]

I made a simple modification to the echo example in which I use a message that is type bytes:

message BytesMessage {
    bytes id =1;
}

Changed the proto for EchoBody to use BytesMessage:

    rpc EchoBody(BytesMessage) returns (BytesMessage) {
        option (google.api.http) = {
            post: "/v1/example/echo_body"
            body: "*"
        };
    }

Modified echo.go:EchoBody to be:

func (s *echoServer) EchoBody(ctx context.Context, msg *examples.BytesMessage) (*examples.BytesMessage, error) {

And then when I send invalid information:

➜   curl -X POST -k http://localhost:8080/v1/example/echo_body -H "Content-Type: text/plain" -d '{"id": "notbase64"}'`
{"error":"illegal base64 data at input byte 8","code":3}%                                                                                                                                  ➜  

It panics:

➜  ./examples
panic: net/http: CloseNotify called after ServeHTTP finished

goroutine 7 [running]:
panic(0x7efa00, 0xc82000bd00)
    /usr/lib/go/src/runtime/panic.go:464 +0x3e6
net/http.(*response).CloseNotify(0xc8201101a0, 0x0)
    /usr/lib/go/src/net/http/server.go:1535 +0x9d
github.com/gengo/grpc-gateway/examples/examplepb.RegisterEchoServiceHandler.func2.1(0x7fdb33c0ae98, 0xc8201101a0, 0xc82000bbc0)
    /home/diogo/go/src/github.com/gengo/grpc-gateway/examples/examplepb/echo_service.pb.gw.go:127 +0x27
created by github.com/gengo/grpc-gateway/examples/examplepb.RegisterEchoServiceHandler.func2
    /home/diogo/go/src/github.com/gengo/grpc-gateway/examples/examplepb/echo_service.pb.gw.go:129 +0x132

[yugui]

Maybe fixed by #120