Change a few things

client/rpc_request.go

@@ -1,10 +1,15 @@
 package client
 
+import (
+	"github.com/micro/go-micro/codec"
+)
+
 type rpcRequest struct {
 	service     string
 	method      string
 	contentType string
-	request     interface{}
+	codec       codec.Codec
+	body        interface{}
 	opts        RequestOptions
 }
 
@@ -23,7 +28,7 @@ func newRequest(service, method string, request interface{}, contentType string,
 	return &rpcRequest{
 		service:     service,
 		method:      method,
-		request:     request,
+		body:        request,
 		contentType: contentType,
 		opts:        opts,
 	}
@@ -41,8 +46,12 @@ func (r *rpcRequest) Method() string {
 	return r.method
 }
 
-func (r *rpcRequest) Request() interface{} {
-	return r.request
+func (r *rpcRequest) Body() interface{} {
+	return r.body
+}
+
+func (r *rpcRequest) Codec() codec.Writer {
+	return r.codec
 }
 
 func (r *rpcRequest) Stream() bool {