diff --git a/f8/httpclientpool.h b/f8/httpclientpool.h
index eac7f86..c0e6e80 100644
--- a/f8/httpclientpool.h
+++ b/f8/httpclientpool.h
@@ -3,7 +3,11 @@
 namespace f8
 {
 
-    struct HttpContext;
+    struct HttpContext
+    {
+        std::string response;
+    };
+
     typedef std::function<void(bool, a8::XObject*, f8::HttpContext*)> HttpProxyCb;
 
     class HttpClientPoolImpl;