public AuthServiceBuilder addBasicAuth(Authorizer<? super BasicToken> authorizer, CharSequence header) {
        return addTokenAuthorizer(new BasicTokenExtractor(requireNonNull(header, "header")),
                                  requireNonNull(authorizer, "authorizer"));
    }
Adds an HTTP basic {@link Authorizer} for the given {@code header}.
core/src/main/java/com/linecorp/armeria/server/auth/AuthServiceBuilder.java