setting host part of address as :authority pseudo header.

grpc-go uses a slightly different naming scheme(https://github.com/grpc/grpc/blob/master/doc/naming.md)
This will end up setting rfc non-complient :authority header to address string (e.g. tcp://127.0.0.1:1234).
So, this commit changes to sets right authority header via WithAuthority DialOption.

Signed-off-by: Shingo Omura <everpeace@gmail.com>

client/client.go

@@ -6,6 +6,7 @@ import (
 	"crypto/x509"
 	"io/ioutil"
 	"net"
+	"net/url"
 	"time"
 
 	grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
@@ -74,6 +75,15 @@ func New(ctx context.Context, address string, opts ...ClientOpt) (*Client, error
 		address = appdefaults.Address
 	}
 
+	// grpc-go uses a slightly different naming scheme: https://github.com/grpc/grpc/blob/master/doc/naming.md
+	// This will end up setting rfc non-complient :authority header to address string (e.g. tcp://127.0.0.1:1234).
+	// So, here sets right authority header via WithAuthority DialOption.
+	addressUrl, err := url.Parse(address)
+	if err != nil {
+		return nil, err
+	}
+	gopts = append(gopts, grpc.WithAuthority(addressUrl.Host))
+
 	unary = append(unary, grpcerrors.UnaryClientInterceptor)
 	stream = append(stream, grpcerrors.StreamClientInterceptor)
 
@@ -192,5 +202,5 @@ func resolveDialer(address string) (func(string, time.Duration) (net.Conn, error
 		return f, nil
 	}
 	// basic dialer
-	return dialer, nil
+	return nil, nil
 }