NGX_HTTP_LINGERING_ON  117 src/http/ngx_http_core_module.c     { ngx_string("on"), NGX_HTTP_LINGERING_ON },
NGX_HTTP_LINGERING_ON 3853 src/http/ngx_http_core_module.c                               prev->lingering_close, NGX_HTTP_LINGERING_ON);
NGX_HTTP_LINGERING_ON 2543 src/http/ngx_http_request.c         || (clcf->lingering_close == NGX_HTTP_LINGERING_ON