status code

nginx
https://github.com/nginx/nginx/blob/5dc242e8f75eae718c1a941e663d7f483acf7c62/src/http/ngx_http_request.h#L72-L142

独自の status code あり

Apache HTTP Server
https://github.com/apache/httpd/blob/2517583a449cc109733e443f8994bf7782687bdc/include/httpd.h#L491-L551

HTTP_IM_A_TEAPOT あり。要る・・？