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

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;
        }

Answer 2

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.

Answer 3

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

Answer 4

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.

Answer 5

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()

Answer 6

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.