@Deprecated
    public OAuth2TokenIntrospectionAuthorizerBuilder clientBasicAuthorization(
            Supplier<String> authorizationSupplier) {
        requireNonNull(authorizationSupplier, "authorizationSupplier");
        final ClientAuthorization clientAuthorization =
                ClientAuthorization.ofBasicAuthorization(authorizationSupplier);
        return clientAuthentication(clientAuthorization.toClientAuthentication());
    }
Provides client authorization for the OAuth 2.0 Introspection requests based on encoded authorization
token and {@code Basic} authorization type,
as per <a href="https://datatracker.ietf.org/doc/html/rfc6749#section-2.3">[RFC6749], Section 2.3</a>.

@param authorizationSupplier A supplier of encoded client authorization token.

@deprecated Use {@link #clientAuthentication(Supplier)} with {@link ClientAuthentication#ofBasic(String)}
            instead.
oauth2/src/main/java/com/linecorp/armeria/server/auth/oauth2/OAuth2TokenIntrospectionAuthorizerBuilder.java