Question

我现在已经被困了将近一个星期了，VISA服务有这个授权API，它使用事务令牌和会话令牌进行身份验证，出于某种原因，它会返回：

远程服务器错误（400）错误请求。

我几乎尝试过所有事情，包括：

Json格式化（注释代码）
切换到WebClient组件

似乎没有任何效果，这就是代码：

string statusCode;

string body =
     "{" +
      "\"transactionToken\": \"" + transactionToken + "\"," +
      "\"sessionToken\": \"" + sessionToken + "\"" +
     "}";

string requestURL = "https://devapice.vnforapps.com/api.authorization/api/v1/authorization/web/{MyMerchantId}";
string id = "xxxxxx";
string password = "yyyyyyy";
string respuesta = "";

try
{
    HttpWebRequest request = WebRequest.Create(requestURL) as HttpWebRequest;
    request.Method = "POST";
    request.ContentType = "application/json";
    request.Accept = "application/json";

    var requestStringBytes = Encoding.UTF8.GetBytes(body);
    request.GetRequestStream().Write(requestStringBytes, 0, requestStringBytes.Length);

    request.Headers["Authorization"] = GetBasicAuthHeader(id, password);
    request.Headers["VisaNet-Session-Key"] = sessionToken;

    /*   
    using (var streamWriter = new StreamWriter(request.GetRequestStream()))
    {
        var json =  JsonConvert.SerializeObject(new
        {
            transactionToken = transactionToken,
            sessionToken = sessionToken
         }, Formatting.Indented);

        streamWriter.Write(json);
    }
    */

    using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
    {

        statusCode = response.StatusCode.ToString();
        Stream receiveStream = response.GetResponseStream();
        StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8);
        respuesta = readStream.ReadToEnd();
    }
}
catch (WebException ex)
{
    using (WebResponse response = ex.Response)
    {
        var httpResponse = (HttpWebResponse)response;

        using (Stream data = response.GetResponseStream())
        {
            StreamReader sr = new StreamReader(data);
            respuesta = sr.ReadToEnd();
        }
    }
}

有一个先前的和第一个API为本赛季的剩余时间创建一个会话密钥，我将这个会话密钥存储在一个Session变量中，可能会发生什么？，我已经阅读了很多类似的这里的案件，并试图运用最好的，没有运气。

GetBasicAuthHeader函数是一个自定义函数，用于建立一个适用于第一个API的基本身份验证标头。

Answer 1

这可能就像回应告诉你的那样。您的当前代码无法确保在发出请求时刷新所有数据。

如果将请求流和StreamWriter包装在using语句中，则在处理对象时会发生刷新：

string statusCode;

string body =
     "{" +
      "\"transactionToken\": \"" + transactionToken + "\"," +
      "\"sessionToken\": \"" + sessionToken + "\"" +
     "}";

string requestURL = "https://devapice.vnforapps.com/api.authorization/api/v1/authorization/web/{MyMerchantId}";
string id = "xxxxxx";
string password = "yyyyyyy";
string respuesta = "";

try
{
    HttpWebRequest request = WebRequest.Create(requestURL) as HttpWebRequest;
    request.Method = "POST";
    request.ContentType = "application/json";
    request.Accept = "application/json";

    using(var rs = request.GetRequestStream()){
        using(StreamWriter sw = new StreamWriter(rs)){
            sw.Write(body);
        }
    }
    request.Headers["Authorization"] = GetBasicAuthHeader(id, password);
    request.Headers["VisaNet-Session-Key"] = sessionToken;



    using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
    {

        statusCode = response.StatusCode.ToString();
        using(StreamReader sr = new StreamReader(response.GetResponseStream()){
            respuesta = sr.ReadToEnd();
        }
    }
}
catch (WebException ex)
{
    using (WebResponse response = ex.Response)
    {
        var httpResponse = (HttpWebResponse)response;

        using (Stream data = response.GetResponseStream())
        {
            StreamReader sr = new StreamReader(data);
            respuesta = sr.ReadToEnd();
        }
    }
}

编辑：

如果这不起作用，请使用Fiddler检查HTTP请求，并确保它符合该服务的任何规范。

HttpWebRequest for VISA服务不断返回400

1 个答案: