Android Volley gives me 400 error

本文来自：http://stackoverflow.com/questions/21739276/android-volley-gives-me-400-error

本人是根据文中的其中一方法：

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

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

now it works great!

以下是全文

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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!

android rest android-volley

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edited Feb 12 '14 at 21:47

asked Feb 12 '14 at 20:50 Loolooii 2,577104171

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 – panini Feb 12 '14 at 20:54

@panini I'm already setting the base64 code as "somecodehere". – Loolooii Feb 12 '14 at 21:16

@Loolooii I have the same problem, did you find a solution ? – Robby Smet May 19 '14 at 11:36

@just8laze I'm just using Android's AsyncTask. It's much simpler and it works perfect. See this thread: stackoverflow.com/questions/9671546/asynctask-android-exampl‌​e – Loolooii May 19 '14 at 11:53

@Loolooii Yeah, I already have it working with AsyncTask and HttpPost. No idea why it doesn't work with Volley. Thanks for the response. – Robby Smet May 19 '14 at 11:56

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9 Answers

activeoldestvotes

up vote5down vote

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

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

now it works great!

shareimprove this answer

answered Nov 7 '15 at 15:02   user3136364

ahmagad this worked. – Bolling Oct 6 at 14:05

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up vote3down vote

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

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answered Feb 12 '14 at 20:58 Leonardo Pinto 18025

1

it's something else, JsonRequest has that by default – thepoosh Feb 12 '14 at 21:03

I think @thepoosh is right, anyway I tried it and still getting the same error. – Loolooii Feb 12 '14 at 21:16

it's a server error, check the API – thepoosh Feb 12 '14 at 21:17

@thepoosh its not a server error, its a bad request which means if anything its a client error – panini Feb 12 '14 at 21:20

I meant to say, server initiated error, meaning the API was misused – thepoosh Feb 12 '14 at 21:23

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up vote1down vote

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.

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edited Sep 3 '15 at 8:16 Amir 2,04711323

answered Apr 17 '15 at 8:47 stackex 1,5751312

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up vote0down vote

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;
        }

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answered Nov 18 '14 at 16:32 dhiku 1,0561328

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up vote0down vote

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.

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answered Jan 6 '15 at 9:31 neferpitou 6691917

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up vote0down vote

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.

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edited Dec 17 '15 at 16:39

answered Dec 17 '15 at 16:33 Raul Pinto 822512

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up vote0down vote

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";
       }
   

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answered Mar 17 at 21:28 Kashi 361

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up vote0down vote

There can be multiple reasons for this error. One ofcouse as said by others is, maybe you are missing or have improperly set 'Content-type' header. If you are properly implemented that, other 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 problem in GET requests through volley. You need to find another way around it. Thats all.

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answered Apr 11 at 11:49 Rohit 115

1

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– silwar Apr 11 at 12:43

This answer worked for me. That is why I posted it here. – Rohit Apr 11 at 15:46

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up vote-1down vote

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 An