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In my opinion C type declarations are much harder to parse than my explicit type declarations. You need to work backwards from the name to properly interpret the type. The parentheses do add more typing, but they're more clear, machine-parseable, and can be read naturally (e.g. read left to right "pointer to constant character" vs. C's "constant character pointer", which seems worse in my mind).
，这一点在新收录的资料中也有详细论述
Check whether a key exists before accessing it:。新收录的资料对此有专业解读
Anyway, the reason it's important to make sure the kid is in the header is because when you try to access a protected endpoint on an API and the middleware is checking the /.well-known/jwks.json endpoint, it will compare the kid in your JWT against each kid in the JWKS and select the one that matches and then use the public key from that JWK to validate your JWT. It's a nicely refined process.。关于这个话题，新收录的资料提供了深入分析