fix clients

http.go

@@ -74,7 +74,7 @@ func (h *httpClient) call(ctx context.Context, address string, req client.Reques
 	}
 
 	// marshal request
-	b, err := cf.Marshal(req.Request())
+	b, err := cf.Marshal(req.Body())
 	if err != nil {
 		return errors.InternalServerError("go.micro.client", err.Error())
 	}

request.go

@@ -2,6 +2,7 @@ package http
 
 import (
 	"github.com/micro/go-micro/client"
+	"github.com/micro/go-micro/codec"
 )
 
 type httpRequest struct {
@@ -43,7 +44,11 @@ func (h *httpRequest) Method() string {
 	return h.method
 }
 
-func (h *httpRequest) Request() interface{} {
+func (h *httpRequest) Codec() codec.Writer {
+	return nil
+}
+
+func (h *httpRequest) Body() interface{} {
 	return h.request
 }