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

client_stream.go

@@ -0,0 +1,13 @@
+package http
+
+import (
+	"context"
+
+	"go.unistack.org/micro/v3/client"
+)
+
+// TODO: Add stream support in the future.
+
+func (c *Client) fnStream(context.Context, client.Request, ...client.CallOption) (client.Stream, error) {
+	panic("not implemented")
+}