NGX_HTTP_LAST_4XX  109 src/http/ngx_http_header_filter_module.c #define NGX_HTTP_OFF_5XX   (NGX_HTTP_LAST_4XX - 400 + NGX_HTTP_OFF_4XX)
NGX_HTTP_LAST_4XX  247 src/http/ngx_http_header_filter_module.c                    && status < NGX_HTTP_LAST_4XX)
NGX_HTTP_LAST_4XX  339 src/http/ngx_http_special_response.c #define NGX_HTTP_OFF_5XX   (NGX_HTTP_LAST_4XX - 400 + NGX_HTTP_OFF_4XX)
NGX_HTTP_LAST_4XX  450 src/http/ngx_http_special_response.c                && error < NGX_HTTP_LAST_4XX)