mtgclient

 public String query(String path, HashMap<String, String> args) {
        String answer = "";
        try {
            // add nonce and build arg list
            args.put("nonce", String.valueOf(System.currentTimeMillis()));
            String post_data = this.buildQueryString(args);
            String post_data_mac = path + "\0" + post_data;

            // args signature
            Mac mac = Mac.getInstance(SIGN_HASH_FUNCTION);
            SecretKeySpec secret_spec = new SecretKeySpec(Base64.decodeBase64(this.keys.getPrivateKey()), SIGN_HASH_FUNCTION);
            mac.init(secret_spec);
            String signature = Base64.encodeBase64String(mac.doFinal(post_data_mac.getBytes()));

            // build URL
            URL queryUrl = new URL(API_BASE_URL + path);

            // create connection
            HttpURLConnection connection = (HttpURLConnection)queryUrl.openConnection();
            connection.setDoOutput(true);

            // set signature
            connection.setRequestProperty("User-Agent", settings.APP_TITLE);
            connection.setRequestProperty("Rest-Key", this.keys.getApiKey());
            connection.setRequestProperty("Rest-Sign", signature.replaceAll("\n", ""));


            if (connection.getResponseCode() != 200) {
			System.err.println("Failed : HTTP error code : "
					+ connection.getResponseCode());
		}

            BufferedReader br = new BufferedReader(new InputStreamReader((connection.getInputStream())));

            String output;
            System.out.println("HTTP response \n");
		while ((output = br.readLine()) != null) {
			System.out.println(output);
                        answer+=output;
		}
            connection.disconnect();

        } catch (Exception ex) {
            Logger.getLogger(MtGox.class.getName()).log(Level.SEVERE, null, ex);
        }
        return answer;
    }