public ClientAuthentication toClientAuthentication() {
        return new ClientAuthentication() {
            @Override
            public void addAsHeaders(HttpHeadersBuilder headersBuilder) {
                headersBuilder.add(HttpHeaderNames.AUTHORIZATION, asHeaderValue());
            }

            @Override
            public void addAsBodyParams(QueryParamsBuilder formBuilder) {
                // ClientAuthorization is not used as body parameters under the current API usage.
            }
        };
    }
Converts this {@link ClientAuthorization} to a {@link ClientAuthentication}.
oauth2/src/main/java/com/linecorp/armeria/common/auth/oauth2/ClientAuthorization.java