# HG changeset patch
# User Valentin Bartenev <vbart@nginx.com>
# Date 1466099711 -10800
# Node ID e2f13011343ea57d3e923929e8260981f2dff852
# Parent  12b1df4c99445a60c7bf0b214af5f196497eb97e
HTTP/2: fixed the "http request count is zero" alert.

When the stream is terminated the HEADERS frame can still wait in the output
queue.  This frame can't be removed and must be sent to the client anyway,
since HTTP/2 uses stateful compression for headers.  So in order to postpone
closing and freeing memory of such stream the special close stream handler
is set to the write event.  After the HEADERS frame is sent the write event
is called and the stream will be finally closed.

Some events like receiving a RST_STREAM can trigger the read handler of such
stream in closing state and cause unexpected processing that can result in
another attempt to finalize the request.  To prevent it the read handler is
now set to ngx_http_empty_handler.

Thanks to Amazon.

diff --git a/src/http/v2/ngx_http_v2.c b/src/http/v2/ngx_http_v2.c
--- a/src/http/v2/ngx_http_v2.c
+++ b/src/http/v2/ngx_http_v2.c
@@ -3935,6 +3935,7 @@ ngx_http_v2_close_stream(ngx_http_v2_str
 
     if (stream->queued) {
         fc->write->handler = ngx_http_v2_close_stream_handler;
+        fc->read->handler = ngx_http_empty_handler;
         return;
     }