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..
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.