Add proxy string method

proxy/grpc/grpc.go

@@ -136,6 +136,10 @@ func (p *Proxy) ServeRequest(ctx context.Context, req server.Request, rsp server
 	}
 }
 
+func (p *Proxy) String() string {
+        return "grpc"
+}
+
 // NewProxy returns a new grpc proxy server
 func NewProxy(opts ...proxy.Option) proxy.Proxy {
 	var options proxy.Options

proxy/http/http.go

@@ -188,6 +188,10 @@ func (p *Proxy) ServeRequest(ctx context.Context, req server.Request, rsp server
 	}
 }
 
+func (p *Proxy) String() string {
+        return "http"
+}
+
 // NewSingleHostProxy returns a router which sends requests to a single http backend
 func NewSingleHostProxy(url string) proxy.Proxy {
 	return &Proxy{

proxy/mucp/mucp.go

@@ -521,6 +521,10 @@ func (p *Proxy) serveRequest(ctx context.Context, link client.Client, service, e
 	}
 }
 
+func (p *Proxy) String() string {
+	return "mucp"
+}
+
 // NewSingleHostProxy returns a proxy which sends requests to a single backend
 func NewSingleHostProxy(endpoint string) *Proxy {
 	return &Proxy{

proxy/proxy.go

@@ -13,6 +13,8 @@ type Proxy interface {
 	ProcessMessage(context.Context, server.Message) error
 	// ServeRequest handles inbound requests
 	ServeRequest(context.Context, server.Request, server.Response) error
+	// Name of the proxy protocol
+	String() string
 }
 
 var (