fix segfault

src/http/ngx_http_request.c

diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
index f6dcd6a..e472658 100644
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -1491,6 +1491,7 @@
 
     if (rc == NGX_ERROR
         || rc == NGX_HTTP_REQUEST_TIME_OUT
+        || rc == NGX_HTTP_CLIENT_CLOSED_REQUEST
         || r->connection->error)
     {
         if (rc == NGX_HTTP_CLIENT_CLOSED_REQUEST