check in this cruft

response.go

@@ -0,0 +1,35 @@
+package grpc
+
+import (
+	"net/http"
+
+	"github.com/micro/go-micro/codec"
+	"github.com/micro/go-micro/transport"
+)
+
+type rpcResponse struct {
+	header map[string]string
+	socket transport.Socket
+	codec  codec.Codec
+}
+
+func (r *rpcResponse) Codec() codec.Writer {
+	return r.codec
+}
+
+func (r *rpcResponse) WriteHeader(hdr map[string]string) {
+	for k, v := range hdr {
+		r.header[k] = v
+	}
+}
+
+func (r *rpcResponse) Write(b []byte) error {
+	if _, ok := r.header["Content-Type"]; !ok {
+		r.header["Content-Type"] = http.DetectContentType(b)
+	}
+
+	return r.socket.Send(&transport.Message{
+		Header: r.header,
+		Body:   b,
+	})
+}