$ headless-seo-check http://127.0.0.1:4315/app -a --plain
--- stdout+stderr ---
headless-seo-check: checking the whole of http://127.0.0.1:4315; the path you gave (/app) is ignored — use --urls /app to check just that page
headless-seo-check: checking http://127.0.0.1:4315 …
headless-seo-check: no sitemap found for http://127.0.0.1:4315
headless-seo-check:   looked at robots.txt, /sitemap.xml and /sitemap_index.xml
headless-seo-check:   use --urls /,/some-page to check specific pages instead
run	http://127.0.0.1:4315	-	0	0
summary	fatal	no-sitemap
detail	http://127.0.0.1:4315	no-sitemap	no sitemap found for http://127.0.0.1:4315
detail	http://127.0.0.1:4315	no-sitemap	looked at robots.txt, /sitemap.xml and /sitemap_index.xml
detail	http://127.0.0.1:4315	no-sitemap	use --urls /,/some-page to check specific pages instead
summary	blocking	0
summary	exit_code	2
--- exit code: 2 ---