android volley 给客户端错误代码 400

Question

我正在尝试发出 POST 请求以从我的 Web API(由 asp.net mvc 编写)获取 token ，它在 Postman 中有效(我得到一个有效的 JSON 对象)，但不使用 Volley。使用以下代码:

  String url = "https://branj.ir/Token";

    Response.Listener<String> listener= new Response.Listener<String>() {
      @Override
      public void onResponse(String jsonResult) {

        Log.i(G.Tag, "volley result: " + jsonResult);
      }
    };
    Response.ErrorListener errorListener=   new Response.ErrorListener() {
      @Override
      public void onErrorResponse(VolleyError error) {

        error.printStackTrace();
        Log.d(G.Tag, "Error: " + error
          + "\nStatus Code " + error.networkResponse.statusCode
          + "\nCause " + error.getCause()
          + "\nmessage" + error.getMessage());
      }
    };

    StringRequest   request = new StringRequest  (
      Request.Method.POST,
      url,
      listener,
      errorListener

    )
 {
      @Override
      public Map<String, String> getHeaders() throws AuthFailureError {
        Map<String,String> params = new HashMap<String, String>();
        params.put("Content-Type","application/x-www-form-urlencoded");
        params.put("Accept", "application/json");
        return params;
      } }
 ;

logcat 是:

 BasicNetwork.performRequest: Unexpected response code 400 for https://branj.ir/Token
11-13 16:55:59.608 21200-21200/ir.branj.app.wideidea.ir.branj D/Branj: Error: com.android.volley.ClientError
    Status Code 400
    Cause null
    messagenull

Answer 1

我修改了应用代码如下，我的问题解决了

 public static void Token(final String username, final String password) {

    String url = BASE_URL + "Token";

    Response.Listener<String> listener= new Response.Listener<String>() {
      @Override
      public void onResponse(String jsonResult) {

        Log.i(G.Tag, "volley result: " + jsonResult);
      }
    };
    Response.ErrorListener errorListener=   new Response.ErrorListener() {
      @Override
      public void onErrorResponse(VolleyError error) {
        error.printStackTrace();
        Log.d(G.Tag, "Error: " + error
          + "\nStatus Code " + error.networkResponse.statusCode
          + "\nCause " + error.getCause()
          + "\nnetworkResponse " + error.networkResponse.data.toString()
          + "\nmessage" + error.getMessage());
      }
    };

    StringRequest   request = new StringRequest  (
      Request.Method.POST,
      url,
      listener,
      errorListener
    )
    {
      @Override
      public Map<String, String> getParams() throws AuthFailureError {
        Map<String,String> params = new HashMap<>();
        params.put("username", username);
        params.put("password", password);
        params.put("grant_type", "password");
        return params;
      }
    } ;
    G.getInstance().addToRequestQueue(request);
  }