add h2c/http2 support with WithoutCmux option

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

service/options.go

@@ -334,6 +334,13 @@ func WithReactUI(fs fs.FS, subpath string) Option {
 	}
 }
 
+// WithoutCmux disables the use of cmux for http support to instead use grpc.Server.ServeHTTP method when http support is enabled
+func WithoutCmux() Option {
+	return func(o *options) {
+		o.withoutCmux = true
+	}
+}
+
 type options struct {
 	ctx     context.Context
 	name    string
@@ -381,6 +388,7 @@ type options struct {
 
 	error         error
 	gatewayPrefix string
+	withoutCmux   bool
 }
 
 func (o *options) Name() string {
@@ -499,6 +507,10 @@ func (o *options) GatewayOpts() []runtime.ServeMuxOption {
 	return o.gatewayOpts
 }
 
+func (o *options) WithoutCmux() bool {
+	return o.withoutCmux
+}
+
 func (o *options) parseTLSConfig() error {
 	if o.tlsConfig != nil {
 		return nil