HttpWebRequest.getResponse()返回NULL

时间:2019-01-02 01:56:39

标签: c# httprequest httpresponse

我正在尝试创建一个将WebRequest发送到网站的控制台应用程序,以便我可以JSON格式从中获取一些信息。建立请求并尝试获取响应后,我只想简单地打印出数据,但是当我调用httpWebRequest.getResponse()时,它将返回NULL。

我尝试了多种其他方法将数据发送到url,但是这些方法都给我类似404或400错误的信息,等等。这种方法至少不会给我任何错误,只是一个NULL。

以下是我正在使用的API文档的快照(尽管文档尚未完成):

这是我现在拥有的控制台应用程序代码:

    try
        {
            var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://api.remot3.it/apv/v27/user/login");
            httpWebRequest.ContentType = "application/json";
            httpWebRequest.Method = "POST";
            httpWebRequest.Headers.Add("developerkey", "***KEY***");
            using (var streamWriter = new

            StreamWriter(httpWebRequest.GetRequestStream()))
            {
                string json = new JavaScriptSerializer().Serialize(new
                {
                    email = "***EMAIL***",
                    password = "***PASSWORD***"
                });
                Console.WriteLine(json);
                streamWriter.Write(json);
            }
            var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            {
                var result = streamReader.ReadToEnd();
                Console.WriteLine(result);
                Console.ReadLine();
            }
        }catch(Exception e)
        {
            Console.WriteLine(e.Message);
            Console.WriteLine(e.StackTrace);
            Console.ReadLine();
        }

预期的输出是一些JSON数据,但是我从getResponse()返回了NULL。

1 个答案:

答案 0 :(得分:0)

尝试序列化表单中的凭据,并将标头作为该类的参数发送。 检查下面的代码。它不是100%符合您的要求,但至少会帮助您理解您的逻辑。

这是我从这段代码中得到的Json Response。其工作完美。请记住在您的Web请求上添加超时选项,并在完成任务后最后关闭流阅读器和流。请检查此代码。

  public static string httpPost(string url, string json)
    {
        string content = "";          
        byte[] bs;

        if (json != null && json != string.Empty)
        {
            bs = Encoding.UTF8.GetBytes(json);
        }
        else
        {
            bs = Encoding.UTF8.GetBytes(url);
        }
        HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
        req.Method = "POST";

        if (json != string.Empty)
            req.ContentType = "application/json";
        else
            req.ContentType = "application/x-www-form-urlencoded";
        req.KeepAlive = false;
        req.Timeout = 30000;
        req.ReadWriteTimeout = 30000;
        //req.UserAgent = "test.net";
        req.Accept = "application/json";
        req.ContentLength = bs.Length;
        using (Stream reqStream = req.GetRequestStream())
        {
            reqStream.Write(bs, 0, bs.Length);
            reqStream.Flush();
            reqStream.Close();
        }
        using (WebResponse wr = req.GetResponse())
        {
            Stream s = wr.GetResponseStream();
            StreamReader reader = new StreamReader(s, Encoding.UTF8);
            content = reader.ReadToEnd();
            wr.Close();
            s.Close();
            reader.Close();
        }
        return content;

    }