request interceptor

auth-interceptor.java

class AuthInterceptor implements RequestInterceptor {

  @Override
  public void apply(RequestTemplate template) {
    Map<String, Collection<String>> headers = template.request().headers();
    Collection<String> authorization = headers.get("Authorization");
    if (null != authorization && !authorization.isEmpty()) {
      for (String s : authorization) {
        template.header("Authorization", s);
      }
    }
    ...
  }
}