ngx_http_script_file_exists  807 http/modules/ngx_http_rewrite_module.c             fop->op = ngx_http_script_file_exists;
ngx_http_script_file_exists 1521 http/ngx_http_script.c         case ngx_http_script_file_exists:
ngx_http_script_file_exists 1560 http/ngx_http_script.c     case ngx_http_script_file_exists: