feat: implement http support

Signed-off-by: Kairee Wu <kaireewu@gmail.com>

example/main.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"log"
 	"net"
+	"net/http"
 	"sync"
 
 	"krwu.top/krpc.v1"
@@ -14,6 +15,7 @@ func startServer(addr chan string) {
 	if err := krpc.Register(&foo); err != nil {
 		log.Fatal("register error: ", err)
 	}
+	krpc.HandleHTTP()
 	// pick a free port
 	l, err := net.Listen("tcp", ":0")
 	if err != nil {
@@ -21,7 +23,8 @@ func startServer(addr chan string) {
 	}
 	log.Println("start rpc server on", l.Addr())
 	addr <- l.Addr().String()
-	krpc.Accept(l)
+	_ = http.Serve(l, nil)
+	//krpc.Accept(l)
 }
 
 func main() {
@@ -29,7 +32,7 @@ func main() {
 	addr := make(chan string)
 	go startServer(addr)
 
-	cli, _ := krpc.Dial("tcp", <-addr)
+	cli, _ := krpc.DialHTTP("tcp", <-addr)
 	defer func() { _ = cli.Close() }()
 
 	// send options