Android Volley MalformedURLException:无协议

Question

使用Volley时，我试图发送POST报头并接收StringRequest，但得到了一个RuntimeException，原因是: java.net.MalformedURLException:没有协议，但我有协议。

我发送的cookie和令牌是正确的

下面是我的代码：

HttpClient httpClient = new DefaultHttpClient();
httpPost = new  HttpPost("http://ipServer:portServer/xxx/products.json?place_id=1");

        httpPost.addHeader("Content-type", "application/json");
        httpPost.addHeader("cookie", cookieTmp);
        httpPost.addHeader("X-CSRF-Token", tokenTmp);

StringRequest request = new StringRequest(Request.Method.GET, String.valueOf(httpPost),
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        Log.i("VOLLEY", response);
                        startActivity(new Intent(getApplicationContext(), 
                        MainActivity.class));
                        LoginActivity.this.finish();
                }
                }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {

                L.m("not response");
                handleVolleyError(error);

我得到了这个异常：

E/Volley: [1070] NetworkDispatcher.run: Unhandled exception java.lang.RuntimeException: Bad URL org.apache.http.client.methods.HttpPost@c9461c0
      java.lang.RuntimeException: Bad URL org.apache.http.client.methods.HttpPost@c9461c0
          at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:151)
          at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:114)
       Caused by: java.net.MalformedURLException: no protocol: org.apache.http.client.methods.HttpPost@c9461c0
          at java.net.URL.<init>(URL.java:589)
          at java.net.URL.<init>(URL.java:486)
          at java.net.URL.<init>(URL.java:435)
          at com.android.volley.toolbox.HurlStack.performRequest(HurlStack.java:102)
          at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:97)
          at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:114) 

我在Postman中执行的测试工作正常。你知道这是什么原因造成的吗？