From c85c6b08a186fd50c11f467e976d276008e99a54 Mon Sep 17 00:00:00 2001
From: Masakazu Kitajo <maskit@apache.org>
Date: Wed, 6 Oct 2021 12:40:30 +0900
Subject: [PATCH] Fix a potential H2 stall

---
 proxy/http2/Http2ConnectionState.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/proxy/http2/Http2ConnectionState.cc b/proxy/http2/Http2ConnectionState.cc
index 75e85889cae..5e87fd889b7 100644
--- a/proxy/http2/Http2ConnectionState.cc
+++ b/proxy/http2/Http2ConnectionState.cc
@@ -1655,6 +1655,7 @@ Http2ConnectionState::send_a_data_frame(Http2Stream *stream, size_t &payload_len
 
   if (this->session->write_avail() == 0) {
     Http2StreamDebug(this->session, stream->get_id(), "Not write avail");
+    this->session->flush();
     return Http2SendDataFrameResult::NOT_WRITE_AVAIL;
   }