如何在没有请求正文的情况下发出OKHTTP发布请求？

    RequestBody reqbody = RequestBody.create(null, new byte[0]);  
    Request.Builder formBody = new Request.Builder().url(url).method("POST",reqbody).header("Content-Length", "0");
    clientOk.newCall(formBody.build()).enqueue(OkHttpCallBack());