diff --git a/http.go b/http.go
index <HASH>..<HASH> 100644
--- a/http.go
+++ b/http.go
@@ -69,6 +69,7 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 	}()
 
+	w.WriteHeader(http.StatusOK)
 	flusher.Flush()
 
 	// Push events to client
Add w.WriteHeader() call before first Flush() (#<I>)