Android Volley 给我 400 错误

Question

我正在尝试向我的 API 发出 POST 请求，它在 Postman 中工作(我得到一个有效的 JSON 对象)，但不使用 Volley 。使用以下代码:

String URL = "http://somename/token";
RequestQueue queue = Volley.newRequestQueue(StartActivity.this);
queue.add(new JsonObjectRequest(Method.POST, URL, null,
   new Listener<JSONObject>() {
       @Override
       public void onResponse(JSONObject response) {
           // handle response
           Log.i("StartActivity", response.toString());
       }
   }, new ErrorListener() {
       @Override
       public void onErrorResponse(VolleyError error) {
           // handle error   
           Log.i("StartActivity", error.toString());
       }
   }) {

   @Override
   public Map<String, String> getHeaders() throws AuthFailureError {
       HashMap<String, String> headers = new HashMap<String, String>();
       headers.put("username", "someUsername");
       headers.put("password", "somePassword");
       headers.put("Authorization", "Basic someCodeHere");
       return headers;
   }
   @Override
    protected Map<String,String> getParams(){
        Map<String,String> params = new HashMap<String, String>();
        params.put("grant_type", "client_credentials");

            return params;
        }
   });

我收到以下错误:

02-12 21:42:54.774: E/Volley(19215): [46574] BasicNetwork.performRequest: Unexpected response code 400 for http://somename/token/

我看过很多例子，但我真的不明白这里出了什么问题。有人知道吗？

我用这个方法更新了代码:

HashMap<String, String> createBasicAuthHeader(String username, String password) {
        HashMap<String, String> headerMap = new HashMap<String, String>();

        String credentials = username + ":" + password;
        String base64EncodedCredentials =
                Base64.encodeToString(credentials.getBytes(), Base64.NO_WRAP);
        headerMap.put("Authorization", "Basic " + base64EncodedCredentials);

        return headerMap;
    }

并将 getHeaders() 更改为:

@Override
   public Map<String, String> getHeaders() throws AuthFailureError {
       return createBasicAuthHeader("username", "password");
   }

还是出现同样的错误!

Answer 1

我遇到了同样的问题，我从标题中删除了:

  headers.put("Content-Type", "application/json");

现在效果很好!