集成skyscanner api实现实时价格

Question

我试图从skyscanner api url http://partners.api.skyscanner.net/apiservices/pricing/v1.0获取轮询的Location header url，但是我得到了500 Volley服务器错误。谁能告诉我我哪里做错了。我在Chrome的Postman中得到了报头响应。

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public class MainActivity extends AppCompatActivity {
    private static final String URL = "http://partners.api.skyscanner.net/apiservices/pricing/v1.0";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void go(View v){
        skyscannerpriceapi();
    }

    private void skyscannerpriceapi() {

        Map<String, String> params = new HashMap<String, String>();
        params.put("apiKey", "MY_API_KEY");
        params.put("country", "US");
        params.put("currency", "USD");
        params.put("locale", "en-US");
        params.put("originplace", "FLL");
        params.put("destinationplace", "MCO");
        params.put("outbounddate", "2016-07-20");
        params.put("inbounddate", "2016-07-27");
        params.put("locationschema", "iata");
        params.put("cabinclass", "Economy");
        params.put("adults", "1");
        params.put("children", "0");
        params.put("infants", "0");
        params.put("groupPricing", "false");

        JsonObjectRequest objectRequest = new JsonObjectRequest(
                Request.Method.POST,
                URL,
                new JSONObject(params),

                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        Toast.makeText(MainActivity.this, response.toString(), Toast.LENGTH_SHORT).show();
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        Toast.makeText(MainActivity.this, error.toString(), Toast.LENGTH_SHORT).show();
                    }
                }) {



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


        RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
        requestQueue.add(objectRequest);
    }

}

​