code: protected ClientHttpRequestInterceptor buildAddBasicAuthHeaderRequestInterceptor(String user, String password){
  		return new AddHeaderRequestInterceptor(HEADER_AUTHORIZATION, buildBasicAuthValue(user, password));
  	}
docs: Build a ClientHttpRequestInterceptor that adds BasicAuth header
  @param user			the user name, may be null or empty
  @param password		the password, may be null or empty
  @return	the ClientHttpRequestInterceptor built