hello_http_2: {"error":"transport is closing","code":14} about go-grpc-tutorial

[JesseYan]

set export GODEBUG=http2debug=2 in shell, and got this in rpc_server main.go in cycle when run man.go:

....
2018/03/20 16:26:21 http2: Framer 0xc420c8c000: wrote SETTINGS len=0
2018/03/20 16:26:21 http2: Framer 0xc420ec8000: wrote SETTINGS len=0
2018/03/20 16:26:21 http2: Framer 0xc420ec82a0: wrote SETTINGS len=0
2018/03/20 16:26:21 http2: Framer 0xc420c8c460: wrote SETTINGS len=0
2018/03/20 16:26:21 http2: Framer 0xc420ec8620: wrote SETTINGS len=0
2018/03/20 16:26:21 http2: Framer 0xc420c8c000: wrote SETTINGS len=0
2018/03/20 16:26:21 http2: Framer 0xc420ec80e0: wrote SETTINGS len=0
2018/03/20 16:26:21 http2: Framer 0xc422758000: wrote SETTINGS len=0
...
...

[jergoo]

@JesseYan
It's normal when use http, I got this error too.
You can read my documentation about this project, I think this is because http2 requires https.

[JesseYan]

@jergoo 我想应该不是http2的问题，我换了一种方式，同样用http，我用两个端口，分别分开用在server和gateway上，可以正常运行。server.go, gateway.go分别见如下：

//server/main.go
package main

import (
	"net"
	pb "proto/bi/service/httpsdemo"
	"golang.org/x/net/context"
	"google.golang.org/grpc"
	"google.golang.org/grpc/reflection"
	"log"
)

// 定义helloHTTPService并实现约定的接口
type helloHTTPService struct{}

// HelloHTTPService Hello HTTP服务
var HelloHTTPService = helloHTTPService{}

// SayHello 实现Hello服务接口
func (h helloHTTPService) SayHello(ctx context.Context, in *pb.HelloHTTPRequest) (*pb.HelloHTTPResponse, error) {
	resp := new(pb.HelloHTTPResponse)
	resp.Message = "Hello " + in.Name + "."

	return resp, nil
}

func main() {
	endpoint := "127.0.0.1:50051"
	lis, err := net.Listen("tcp", endpoint)
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}
	s := grpc.NewServer()
	pb.RegisterHelloHTTPServer(s, &HelloHTTPService)
	// Register reflection service on gRPC server.
	reflection.Register(s)
	if err := s.Serve(lis); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}

//gateway/main.go
package main

import (
	"flag"
	"net/http"

	"github.com/golang/glog"
	"github.com/grpc-ecosystem/grpc-gateway/runtime"
	"golang.org/x/net/context"
	"google.golang.org/grpc"

	gw "proto/bi/service/httpsdemo"
)

var (
	echoEndpoint = flag.String("echo_endpoint", "127.0.0.1:50051", "endpoint of YourService")
)

func run() error {
	ctx := context.Background()
	ctx, cancel := context.WithCancel(ctx)
	defer cancel()

	mux := runtime.NewServeMux()
	opts := []grpc.DialOption{grpc.WithInsecure()}
	err := gw.RegisterHelloHTTPHandlerFromEndpoint(ctx, mux, *echoEndpoint, opts)
	if err != nil {
		return err
	}

	return http.ListenAndServe(":8888", mux)
}

func main() {
	flag.Parse()
	defer glog.Flush()

	if err := run(); err != nil {
		glog.Fatal(err)
	}
}

curl -X POST -k http://127.0.0.1:8888/example/echo -d '{"name": "Jesse Yan"}'

[jergoo]

@JesseYan hello_http里面的示例就是分开做的，但是你注意下分开后的server.go，是不能直接用http请求的