$ headless-seo-check http://127.0.0.1:4399 -a --plain
--- stdout+stderr ---
headless-seo-check: checking http://127.0.0.1:4399 …
headless-seo-check: cannot reach 127.0.0.1:4399: connection refused (nothing listening on that port) (ECONNREFUSED)
headless-seo-check:   robots.txt could not be read — connection refused (nothing listening on that port) (ECONNREFUSED)
headless-seo-check:   http://127.0.0.1:4399/sitemap.xml — connection refused (nothing listening on that port) (ECONNREFUSED)
headless-seo-check:   http://127.0.0.1:4399/sitemap_index.xml — connection refused (nothing listening on that port) (ECONNREFUSED)
run	http://127.0.0.1:4399	-	0	0
summary	fatal	unreachable
detail	http://127.0.0.1:4399	unreachable	cannot reach 127.0.0.1:4399: connection refused (nothing listening on that port) (ECONNREFUSED)
detail	http://127.0.0.1:4399	unreachable	robots.txt could not be read — connection refused (nothing listening on that port) (ECONNREFUSED)
detail	http://127.0.0.1:4399	unreachable	http://127.0.0.1:4399/sitemap.xml — connection refused (nothing listening on that port) (ECONNREFUSED)
detail	http://127.0.0.1:4399	unreachable	http://127.0.0.1:4399/sitemap_index.xml — connection refused (nothing listening on that port) (ECONNREFUSED)
summary	blocking	0
summary	exit_code	2
--- exit code: 2 ---