Android Volley gives me 400 error

Question

I\'m trying to make a POST request to my API and it works in Postman (I get a valid JSON object), but not using Volley. With the follo

Answer 1

If you are passing the json value to in body(raw json).No need to set the content type as headers.put("Content-Type", "application/json; charset=utf-8");

When I was using the content type in header callback ,the 400 response status I was getting in logcat.I commented headers.put("Content-Type", "application/json; charset=utf-8"); as because I am passing raw json in body while calling api.screenshot for postman is attached.It will help

private void volleyCall(String email, String password) {

      RequestQueue queue= Volley.newRequestQueue(this);
      String URL = "http://XXXX.in:8080/XXXX/api/userService/login";

      Map<String, String> jsonParams = new HashMap<String, String>();
      jsonParams.put("email", email);
      jsonParams.put("password", password);
      Log.d(TAG,"Json:"+ new JSONObject(jsonParams));

      JsonObjectRequest postRequest = new JsonObjectRequest( Request.Method.POST, URL,new JSONObject(jsonParams),
              new Response.Listener<JSONObject>() {
                  @Override
                  public void onResponse(JSONObject response) {
                      Log.d(TAG,"Json"+ response);
                  }
              },
              new Response.ErrorListener() {
                  @Override
                  public void onErrorResponse(VolleyError error) {
                      //   Handle Error
                      Log.d(TAG, "Error: " + error
                              + "\nStatus Code " + error.networkResponse.statusCode
                              + "\nResponse Data " + error.networkResponse.data
                              + "\nCause " + error.getCause()
                              + "\nmessage" + error.getMessage());
                  }
              }) {
          @Override
          public Map<String, String> getHeaders() throws AuthFailureError {
              HashMap<String, String> headers = new HashMap<String,String>();
             // headers.put("Content-Type", "application/json; charset=utf-8");
              return headers;
          }
          @Override
          public String getBodyContentType() {
              return "application/json";
          }



      };

      queue.add(postRequest);

  }

---

LogCat:
LoginActivity: Json:{"email":"XXXXXX@gmail.com","password":"abcde"}
LoginActivity: Error: com.android.volley.ServerError
                                                                          
Status Code 400                                                                     
Response Data [B@63ca992                                                                              
Cause null                                                                              
messagenull

Answer 2

400 error is because Content-Type is set wrong. Please do the following.

1. GetHeader function should be as

       @Override
       public Map<String, String> getHeaders() throws AuthFailureError {
   
           Map<String, String> param = new HashMap<String, String>();
   
           return param;
       }
   

2. Add this new override function.

       @Override
       public String getBodyContentType() {
           return "application/json";
       }
   

Answer 3

Check if you are using correct SDK

For Android Studio / IntelliJIDEA:

File -> Project Structure -> Project -> Project SDK 
Modules -> Check each modules "Module SDK" 

Preferably, you should use "Google API (x.x)" instead of Android API

Answer 4

I had the same problem and i removed from the header:

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

now it works great!

Answer 5

There can be multiple reasons for this error.

One reason, of course, as said by others, is that maybe you are missing or have improperly set 'Content-type' header.

If you have properly implemented that, another possible reason is that you are sending params directly from your URL. There may be a case when params is a string with some white spaces in it. These white spaces cause problems in GET requests through Volley. You need to find another way around it. That's all.

Answer 6

I have the same issue before and I got the solution in my project:

RequestQueue requestManager = Volley.newRequestQueue(this);

        String requestURL = "http://www.mywebsite.org";
        Listener<String> jsonListerner = new Response.Listener<String>() {
            @Override
            public void onResponse(String list) {

            }
        };

        ErrorListener errorListener = new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.w("Volley Error", error.getMessage());
            }
        };

        StringRequest fileRequest = new StringRequest(Request.Method.POST, requestURL, jsonListerner,errorListener){
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String,String> params = new HashMap<String, String>();
                params.put("token", account.getToken());
                return params;
            }

            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                HashMap<String, String> headers = new HashMap<String, String>();
                // do not add anything here
                return headers;
            }
        };
        requestManager.add(fileRequest);

In the code Snippet above I used Post Method:

My answer is base on my experience and so take note:

1.) When using POST method use "StringRequest" instead of "JsonObjectRequest"

2.) inside getHeaders Override the value with an Empty HashMap

 example snippet:

        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            Map<String,String> params = new HashMap<String, String>();
            params.put("token", account.getToken());
            return params;
        }

        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            HashMap<String, String> headers = new HashMap<String, String>();
            // do not add anything here
            return headers;
        }

And everything works in my case.