rest – Android Volley gives me 400 error-ThrowExceptions

Exception or error:

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 following code:

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;
        }
   });

I get the following error:

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

I have seen a lot of examples and I don’t really see what is going wrong here. Anyone any idea?

I updated the code with this method:

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;
    }

and changed getHeaders() to:

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

Still getting the same error!

How to solve:

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

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

now it works great!

###

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<S[enter image description here][1]tring, 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

###

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";
        }
    

###

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.

###

400 indicates a bad request, maybe you’re missing Content-Type=application/json on your headers

###

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.

###

I’ve got this error and now Iit’s been fixed. I did what is told in this link. What you need to do is

  1. go to src/com/android/volley/toolbox/BasicNetwork.java
  2. Change the following lines
 if (statusCode < 200 || statusCode > 299) {
     throw new IOException();
 }

with

 if (statusCode < 200 || statusCode > 405) {
     throw new IOException();
 }

Hope this helps.

###

I have removed this params.put(“Content-Type”, “application/x-www-form-urlencoded”);

This is my Code Change.

@Override
        protected Map<String,String> getParams(){
            Map<String,String> params = new HashMap<String, String>();
            if(!isLogout) {
                params.put("username", username);
                params.put("password", password);
                params.put("grant_type", "password");
            } else {
            }
            return params;
        }

        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            Map<String,String> params = new HashMap<String, String>();
            if(isLogout) {
                params.put("Authorization", "bearer "+LibraryDataModel.getToken());
            }else {
            // Removed this line
            // params.put("Content-Type", "application/x-www-form-urlencoded");
            }
            return params;
        }

###

In Android 2.3 there is a problem using Base64.encodeToString() as it introduces a new line in HTTP header. See my response to this question here in SO.

Short answer: Don’t use Base64.encodeToString() but put the already encoded String there.

###

I have find a solution if you are using postman for hitting the api and your api have defined serializer field like skill = serializers.JSONField() then that type of error occurred-

Solution For POSTMAN-
you just add binary=True inside JSONField ex- skill = serializers.JSONField(binary=True)

Solution for Android or other client then-
you just remove binary=True inside JSONField ex- skill = serializers.JSONField()

###

Somertimes this error 400 is arise due to Request type so you need to change the Request.Method.GET to Request.Method.POST and than it works like a charm.

###

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

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