NGX_HTTP_LEVEL_300   79 http/ngx_http_header_filter_module.c #define NGX_HTTP_LEVEL_300       (NGX_HTTP_LAST_LEVEL_300 - 301)
NGX_HTTP_LEVEL_300  305 http/ngx_http_special_response.c #define NGX_HTTP_LEVEL_300       (NGX_HTTP_LAST_LEVEL_300 - 301)