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Android Volley POST string in body

I'm trying to use Volley library to communicate with my RESTful API.

I have to POST string in the body, when I'm asking for the bearer Token. String should look like this: grant_type=password&username=Alice&password=password123 And header: Content-Type: application/x-www-form-urlencoded

More info about WebApi Individual Accounts: http://www.asp.net/web-api/overview/security/individual-accounts-in-web-api

Unfortunately I can't figure out how can I solve it..

I'm trying something like this:

StringRequest req = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        VolleyLog.v("Response:%n %s", response);
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        VolleyLog.e("Error: ", error.getMessage());
                    }
                }){
                    @Override
                    protected Map<String, String> getParams() throws AuthFailureError {
                        Map<String, String> params = new HashMap<String, String>();
                        params.put("grant_type", "password");
                        params.put("username", "User0");
                        params.put("password", "Password0");
                        return params;
                    }

                    @Override
                    public Map<String, String> getHeaders() throws AuthFailureError {
                        Map<String, String> headers = new HashMap<String, String>();
                        headers.put("Content-Type", "application/x-www-form-urlencoded");
                        return headers;
                    }
                };

I'm getting 400 Bad Request all the time. I think that I'm actually sending request like this:

grant_type:password, username:User0, password:Password0

instead of:

grant_type=password&username=Alice&password=password123

I would be very grateful if anyone has any ideas or an advice..

like image 358
Stepan Sanda Avatar asked Feb 27 '14 01:02

Stepan Sanda


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2 Answers

To send a normal POST request (no JSON) with parameters like username and password, you'd usually override getParams() and pass a Map of parameters:

public void HttpPOSTRequestWithParameters() {
    RequestQueue queue = Volley.newRequestQueue(this);
    String url = "http://www.somewebsite.com/login.asp";
    StringRequest postRequest = new StringRequest(Request.Method.POST, url, 
        new Response.Listener<String>() 
        {
            @Override
            public void onResponse(String response) {
                Log.d("Response", response);
            }
        }, 
        new Response.ErrorListener() 
        {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.d("ERROR","error => "+error.toString());
            }
        }
            ) {     
        // this is the relevant method
        @Override
        protected Map<String, String> getParams() 
        {  
            Map<String, String>  params = new HashMap<String, String>();
            params.put("grant_type", "password"); 
            // volley will escape this for you 
            params.put("randomFieldFilledWithAwkwardCharacters", "{{%stuffToBe Escaped/");
            params.put("username", "Alice");  
            params.put("password", "password123");

            return params;
        }
    };
    queue.add(postRequest);
}

And to send an arbitary string as POST body data in a Volley StringRequest, you override getBody()

public void HttpPOSTRequestWithArbitaryStringBody() {
    RequestQueue queue = Volley.newRequestQueue(this);
    String url = "http://www.somewebsite.com/login.asp";
    StringRequest postRequest = new StringRequest(Request.Method.POST, url, 
        new Response.Listener<String>() 
        {
            @Override
            public void onResponse(String response) {
                Log.d("Response", response);
            }
        }, 
        new Response.ErrorListener() 
        {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.d("ERROR","error => "+error.toString());
            }
        }
            ) {  
         // this is the relevant method   
        @Override
        public byte[] getBody() throws AuthFailureError {
            String httpPostBody="grant_type=password&username=Alice&password=password123";
            // usually you'd have a field with some values you'd want to escape, you need to do it yourself if overriding getBody. here's how you do it 
            try {
                httpPostBody=httpPostBody+"&randomFieldFilledWithAwkwardCharacters="+URLEncoder.encode("{{%stuffToBe Escaped/","UTF-8");
            } catch (UnsupportedEncodingException exception) {
                Log.e("ERROR", "exception", exception);
                // return null and don't pass any POST string if you encounter encoding error
                return null;
            }
            return httpPostBody.getBytes();
        }
    };
    queue.add(postRequest);
}

As an aside, Volley documentation is non-existent and quality of StackOverflow answers is pretty bad. Can't believe an answer with an example like this wasn't here already.

like image 129
georgiecasey Avatar answered Sep 19 '22 16:09

georgiecasey


First thing, I advise you to see exactly what you're sending by either printing to the log or using a network sniffer like wireshark or fiddler.

How about trying to put the params in the body? If you still want a StringRequest you'll need to extend it and override the getBody() method (similarly to JsonObjectRequest)

like image 37
Itai Hanski Avatar answered Sep 22 '22 16:09

Itai Hanski