我只是不能得到任何东西从Bing img搜索API，这里是这个API的细节.
https://dev.cognitive.microsoft.com/docs/services/56b43f0ccf5ff8098cef3808/operations/56b4433fcf5ff8098cef380c
由于HttpClient已被弃用，所以我使用httpURLconnection，有人能告诉我我的代码有什么问题吗？
所有的参数和关键是好的，我在网站上测试.

public void run() {
            
            HttpURLConnection connection = null;
            try {
                URL url = new URL("https://api.cognitive.microsoft.com/bing/v5.0/images/search");
                connection = (HttpURLConnection) url.openConnection();
                connection.setRequestMethod("POST");
                connection.setDoInput(true);
                connection.setDoOutput(true);
                connection.setConnectTimeout(8000);
                connection.setReadTimeout(8000);
                connection.setUseCaches(false);
                                    
                connection.setRequestProperty("Ocp-Apim-Subscription-Key", "562eaaada4b644f2bea31a454f26d905");
                OutputStream out = connection.getOutputStream();
                DataOutputStream params =new DataOutputStream(out);
                params.writeBytes("q=dog&count=10&offset=0&mkt=en-us&safeSearch=Moderate");
                out.close();
                
                connection.connect();
                InputStream in = connection.getInputStream();
                
                
                BufferedReader reader = new BufferedReader(new InputStreamReader(in));
                StringBuilder response = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                response.append(line);
                }
                Message message = new Message();
                message.what = SHOW_RESPONSE;
                message.obj = response.toString();
                handler.sendMessage(message);
            } catch (Exception e) {
                // TODO: handle exception
            } finally {
                if (connection != null) {
                    connection.disconnect();
                }
            }
            
        }

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