At very least, because this looks weird:
$ http https://archive.softwareheritage.org/api/1/vault/directory/f557a108b5878c7d7a46e94f538d6bb65379e62e/ HTTP/1.1 404 Not Found Age: 0 Allow: POST, GET, OPTIONS Connection: keep-alive Content-Length: 123 Content-Type: application/json Date: Wed, 25 Nov 2020 08:55:53 GMT Server: gunicorn/19.9.0 Strict-Transport-Security: max-age=15768000; Vary: Accept,Cookie Via: 1.1 archive.softwareheritage.org Via: 1.1 varnish (Varnish/6.1) X-Frame-Options: SAMEORIGIN X-RateLimit-Limit: 60 X-RateLimit-Remaining: 58 X-RateLimit-Reset: 1606294554 X-Varnish: 213079 { "exception": "NotFoundExc", "reason": "Cooking of directory 'f557a108b5878c7d7a46e94f538d6bb65379e62e' was never requested." } $ http POST https://archive.softwareheritage.org/api/1/vault/directory/f557a108b5878c7d7a46e94f538d6bb65379e62e/ HTTP/1.1 200 OK [...] $ http https://archive.softwareheritage.org/api/1/vault/directory/f557a108b5878c7d7a46e94f538d6bb65379e62e/ HTTP/1.1 404 Not Found Age: 99 Allow: POST, GET, OPTIONS Connection: keep-alive Content-Length: 123 Content-Type: application/json Date: Wed, 25 Nov 2020 08:55:53 GMT Server: gunicorn/19.9.0 Strict-Transport-Security: max-age=15768000; Vary: Accept,Cookie Via: 1.1 archive.softwareheritage.org Via: 1.1 varnish (Varnish/6.1) X-Frame-Options: SAMEORIGIN X-RateLimit-Limit: 60 X-RateLimit-Remaining: 58 X-RateLimit-Reset: 1606294554 X-Varnish: 1515525 213080 { "exception": "NotFoundExc", "reason": "Cooking of directory 'f557a108b5878c7d7a46e94f538d6bb65379e62e' was never requested." }