GET on a save code now request for an unknown URL currently returns "nothing" (or, better, an empty list). That is quite puzzling.
If possible, we should return an error message like "unknown save code now request" or something such.
$ curl -D - https://archive.softwareheritage.org/api/1/origin/save/git/url/https://example.com/foo/bar/baz/ HTTP/1.1 200 OK Date: Tue, 16 Apr 2019 17:08:49 GMT Server: gunicorn/19.9.0 X-RateLimit-Limit: 120 X-Frame-Options: SAMEORIGIN Content-Type: application/json Allow: GET, OPTIONS, POST X-RateLimit-Reset: 1555434559 Expires: Tue, 16 Apr 2019 17:08:49 GMT Cache-Control: no-store, max-age=0, must-revalidate, no-cache X-RateLimit-Remaining: 118 Content-Length: 2 Vary: Accept,Cookie Via: 1.1 archive.softwareheritage.org Access-Control-Allow-Origin: * X-Varnish: 39585629 Age: 0 Via: 1.1 varnish (Varnish/5.0) Strict-Transport-Security: max-age=15768000; Accept-Ranges: bytes Connection: keep-alive []%