Throws (rather than returning a placeholder) when the source is unreachable, no
longer states a key, states one that is not shaped like the published key
(looksLikeApiKey: a placeholder, trailing punctuation, a terminal escape), or
states two different ones — so a caller never proceeds with a made-up value.
Fetch the public key from its upstream source.
Throws (rather than returning a placeholder) when the source is unreachable, no longer states a key, states one that is not shaped like the published key (
looksLikeApiKey: a placeholder, trailing punctuation, a terminal escape), or states two different ones — so a caller never proceeds with a made-up value.