diff --git a/proxy/proxy_intercept.go b/proxy/proxy_intercept.go
index b2c16331..45a16558 100644
--- a/proxy/proxy_intercept.go
+++ b/proxy/proxy_intercept.go
@@ -133,6 +133,7 @@ func doChunkedResponse(w http.ResponseWriter, resp *http.Response, client *httpu
 	}
 
 	w.WriteHeader(resp.StatusCode)
+	wf.Flush()
 
 	up, remaining := client.Hijack()
 	defer up.Close()