Question

我想连接“ https://api.tdax.com/api/orders/?pair=btc_thb” 这个网址适用于chrome，邮递员。我可以将此网址与C＃连接。但是不能与Java连接。

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＃代码运行良好但是遵循以下Java代码无法正常工作，则会显示403错误。

    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();
    }

Answer 1

某些服务器希望在请求中包含User-Agent头，以将其视为有效请求。因此，您需要按如下所示将其添加到您的请求中。

con.setRequestProperty("User-Agent", "My-User-Agent");
int responseCode = con.getResponseCode();

此标头的值（在上例中为My-User-Agent）可以设置为此端点所需的任何String。例如，邮递员为此设置了PostmanRuntime/7.16.3之类的东西。

C＃可能在内部执行此操作，因此您不必显式设置它。

Answer 2

public String getOrders(SatangCurrencyPairs currencyPair) throws IOException, BadResponseException {

    String operation="orders/?pair="+currencyPair.toString();
    StringBuilder result = new StringBuilder();
    URL url = new URL(baseUrl+operation);
    //URL url_ = new URL("https://api.tdax.com/api/orders/?pair=btc_thb");
    HttpURLConnection con = (HttpURLConnection) url.openConnection();
    con.setRequestProperty("User-Agent", "java client");
    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();
}

C＃连接，但是Java不连接

2 个答案: