in src/main/java/org/apache/geronimo/microprofile/impl/jwtauth/jwt/SignatureValidator.java [56:64]
private void init() {
useCache = Boolean.parseBoolean(config.read("public-key.cache.active", "true"));
supportedAlgorithms = Stream.of(config.read("header.alg.supported", "RS256").split(","))
.map(String::trim)
.map(s -> s.toLowerCase(Locale.ROOT))
.filter(s -> !s.isEmpty())
.collect(toSet());
jcaProvider = config.read("jca.provider", null);
}