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Flag files on disk use content hashes. Clients should call /get/ and follow the 301, or use the URLs already present on country records. is a lowercase ISO alpha-2 (or similar key). Paths like /flags/nl.svg are not public; only opaque /flags/{24-hex}.svg|png files are served.
CachingSuccessful flag responses send long-lived Cache-Control and CORS headers. Redirects land on hashed filenames so caches stay immutable when artwork changes.