--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -3451,13 +3451,11 @@ ngx_http_set_lingering_close(ngx_connect
         }
     }
 
-    if (c->fd != NGX_INVALID_FILE) {
-        if (ngx_shutdown_socket(c->fd, NGX_WRITE_SHUTDOWN) == -1) {
-            ngx_connection_error(c, ngx_socket_errno,
-                                 ngx_shutdown_socket_n " failed");
-            ngx_http_close_request(r, 0);
-            return;
-        }
+    if (ngx_shutdown_socket(c->fd, NGX_WRITE_SHUTDOWN) == -1) {
+        ngx_connection_error(c, ngx_socket_errno,
+                             ngx_shutdown_socket_n " failed");
+        ngx_http_close_request(r, 0);
+        return;
     }
 
     ngx_add_timer(rev, clcf->lingering_timeout);