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 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!

Philipines

are you sure you're putting in the auth headers correctly? if you're using basic auth you should be base64 encoding the username:password I believe – Baro

@Baro I'm already setting the base64 code as "somecodehere". – Philipines

@just8laze I'm just using Android's AsyncTask. It's much simpler and it works perfect. See this thread: https://mcmap.net/q/14811/-asynctask-android-example – Philipines

@Philipines Yeah, I already have it working with AsyncTask and HttpPost. No idea why it doesn't work with Volley. Thanks for the response. – Manion

@just8laze I'm glad that worked for you and you're welcome. – Philipines

@Loolooii: Have you solved this issue? I am also facing the exact same problem. It will be helpful if you can explain how you solved this issue. Thanks. – Zymotic

@roymathew I ended up using AsyncTask class, but if you want a library you can use this: loopj.com/android-async-http. Honestly I haven't tried to use Volley anymore. – Philipines

Carefully check your JSON request. In my case, it was malformed, hence the error. – Lise

Answer 1

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

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

now it works great!

Nitrometer

Waoooo... awesome... its great – Assailant

Most of the time passing content type in headers wouldn't work, So you must need to override this method to declare the content type: getBodyContentType() – Ine

I was facing issue of 400-Bad request reason I was sending "content-Type" ,"application/json" in headers so this issue resolved by removing content type from headers. – Redstart

Answer 2

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":"[email protected]","password":"abcde"}
LoginActivity: Error: com.android.volley.ServerError
                                                                          
Status Code 400                                                                     
Response Data [B@63ca992                                                                              
Cause null                                                                              
messagenull

Sculpturesque

thanks that's exactly what was happening with me, your answer saved me from hours of head scratching. – Kailyard

i got same thing as u but how to manage to get the response from server and not [B@63ca992 – Confidential

Answer 3

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.

Bonded

This does not provide an answer to the question. Once you have sufficient reputation you will be able to comment on any post; instead, provide answers that don't require clarification from the asker. - From Review – Teakwood

This answer worked for me. That is why I posted it here. – Bonded

This answer is very helpful. The get request url-with-space problem is very tricky. Very thanks for your suggestion – Gumshoe

Answer 4

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";
       }
   

Heller

After spending a couple of hours on this, it is very important that the getHeaders()-method does NOT contain a "Content-Type" header, aside from having to add the getBodyContentType()-method, that is the most important part of this answer. Other headers can be present in the getHeaders()-method however. – Embree

Answer 5

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

Mellow

it's something else, JsonRequest has that by default – Millicent

I think @Millicent is right, anyway I tried it and still getting the same error. – Philipines

@Millicent its not a server error, its a bad request which means if anything its a client error – Baro

I meant to say, server initiated error, meaning the API was misused – Millicent

@Baro I checked the logs and there's nothing. I do the exact same thing in Postman and it works. – Philipines

@Philipines do you have access to the server? I would suggest checking to see if the request does actually match the one seen in Postman. If you don't have access to it, then mitmproxy is good for checking requests. I get the feeling that the request being sent from Volley won't match the Postman one – Baro

@Baro yes I have, it's hosted on Heroku and I just checked the logs. There's no problem at all. – Philipines

@Loolooii, have you tried Accept=application/json? – Mellow

@LeonardoPinto I get a TimeoutError. Do you know how I can fix that? – Philipines

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.

Innuendo

Answer 7

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.

Haversine

Answer 8

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;
        }

Respiratory

Answer 9

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.

Mushro

Answer 10

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()

Blende

Answer 11

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.

Venireman

Answer 12

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

Wesleywesleyan