integrate request builder into HTTP client for googleapis support (#159)

message.go

@@ -1,44 +0,0 @@
-package http
-
-import (
-	"go.unistack.org/micro/v3/client"
-	"go.unistack.org/micro/v3/metadata"
-)
-
-type httpMessage struct {
-	payload     interface{}
-	topic       string
-	contentType string
-	opts        client.MessageOptions
-}
-
-func newHTTPMessage(topic string, payload interface{}, contentType string, opts ...client.MessageOption) client.Message {
-	options := client.NewMessageOptions(opts...)
-
-	if len(options.ContentType) > 0 {
-		contentType = options.ContentType
-	}
-
-	return &httpMessage{
-		payload:     payload,
-		topic:       topic,
-		contentType: contentType,
-		opts:        options,
-	}
-}
-
-func (h *httpMessage) ContentType() string {
-	return h.contentType
-}
-
-func (h *httpMessage) Topic() string {
-	return h.topic
-}
-
-func (h *httpMessage) Payload() interface{} {
-	return h.payload
-}
-
-func (h *httpMessage) Metadata() metadata.Metadata {
-	return h.opts.Metadata
-}