我正在嘗試連接“ https://api.tdax.com/api/orders/?pair=btc_thb ” 這個網址在 chrome、郵遞員上工作。我可以用 C# 連接這個 url。但無法連接java。namespace Exchanges.Satang{    class SatangApi    {        private static class WebApi        {            private static readonly HttpClient st_client = new HttpClient();            static WebApi()            {                st_client.Timeout = TimeSpan.FromSeconds(2);            }            public static HttpClient Client { get { return st_client; } }            public static string Query(string url)            {                var resultString = Client.GetStringAsync(url).Result;                return resultString;            }        }        public static string GetOrders(string symbol)        {            const string queryStr = "https://api.tdax.com/api/orders/?pair=";            var response = WebApi.Query(queryStr + symbol);            return response.ToString();        }    }}此 C# 代碼運行良好，但以下 Java 代碼無法運行，出現 403 錯誤。    private String publicOperation(String operation) throws IOException, BadResponseException {        StringBuilder result = new StringBuilder();        URL url = new URL(baseUrl+operation);        HttpURLConnection con = (HttpURLConnection) url.openConnection();        //con.setRequestProperty("Content-Type", "application/json");        con.setRequestMethod("GET");        //https://api.tdax.com/api/orders/?pair=btc_thb        int responseCode=con.getResponseCode();        if(responseCode!=HttpURLConnection.HTTP_OK){            throw new BadResponseException(responseCode);        }        BufferedReader rd = new BufferedReader(new InputStreamReader(con.getInputStream()));        String line;        while ((line = rd.readLine()) != null) {            result.append(line);        }        rd.close();        return result.toString();    }