fix client write event handling in ngx_http_limit_req_module

src/http/modules/ngx_http_limit_req_module.c

diff --git a/src/http/modules/ngx_http_limit_req_module.c b/src/http/modules/ngx_http_limit_req_module.c
index 2a07c74..7f1685a 100644
--- a/src/http/modules/ngx_http_limit_req_module.c
+++ b/src/http/modules/ngx_http_limit_req_module.c
@@ -263,9 +263,24 @@
 static void
 ngx_http_limit_req_delay(ngx_http_request_t *r)
 {
+    ngx_event_t  *wev;
+
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "limit_req delay");
 
+    wev = r->connection->write;
+
+    if (!wev->timedout) {
+
+        if (ngx_handle_write_event(wev, 0) != NGX_OK) {
+            ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
+        }
+
+        return;
+    }
+
+    wev->timedout = 0;
+
     if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
         ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
         return;