URLConnection usage example

public static String sendGet(String url, String param) {
        StringBuilder result = new StringBuilder();
        BufferedReader br = null;
        
        try {
            String urlName = url + "?" + param;  
            URL realUrl = new URL(urlName);
            
            URLConnection conn = realUrl.openConnection();
            
            conn.setRequestProperty("Accept", "*/*");
            //conn.setRequestProperty("Accept-Encoding", "gzip, deflate");
            conn.setRequestProperty("Connection", "Keep-Alive");
            conn.setRequestProperty("Cache-Control", "no-cache");
            conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E)");
            
            conn.connect();
            
            Map<String, List<String>> respHeaders = conn.getHeaderFields();
            for(String key : respHeaders.keySet()) {
                System.out.println(key + ": " + respHeaders.get(key));
            }
            
            System.out.println("=================Response Body======================");
            
            br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            
            String line = null;
            while((line = br.readLine()) != null) {
                result.append(line);
                result.append('\n');
            }
            System.out.println(result);
            
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if(br != null)
                    br.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        
        return result.toString();
    }