Question

我正在尝试使用 HttpWebRequest 将数据传递到网站上的HTML输入元素，并使用 WebResponse 取回我的请求的响应。

您将找到要在互联网上填写的表单的屏幕截图和响应的屏幕截图。

我的问题是运行代码时，我总是得到响应代码500-内部服务器错误

screen shot of the response on the website

screen shot of input html on the Website

我已经更新了我的代码，以使我的数据具有良好的格式（为此）

但是我仍然遇到相同的失败：响应代码500-内部服务器错误。

这是我更新的c＃代码：

      //input html to be field 
            NameValueCollection Data = new NameValueCollection();
            Data.Add("bResultat", "true");
            Data.Add("ModeAffichage", "COMPLET");
            Data.Add("bImpression", "");
            Data.Add("AERO_Date_DATE", "2018/10/03");
            Data.Add("AERO_Date_HEURE", "20:50");
            Data.Add("AERO_Langue", "FR");
            Data.Add("AERO_Duree", "12");
            Data.Add("AERO_CM_REGLE", "1");
            Data.Add("AERO_CM_GPS", "2");
            Data.Add("AERO_CM_INFO_COMP", "1");
            Data.Add("AERO_Tab_Aero[0]", "EDDM");

            //Create the data in good format
            var parameters = new StringBuilder();
            foreach (string key in Data.Keys)
            {                    
               parameters.AppendFormat("{0}={1}&",
               System.Web.HttpUtility.UrlEncode(key),
               System.Web.HttpUtility.UrlEncode(Data[key]));
            }
            parameters.Length -= 1;               

            byte[] bytedata = Encoding.UTF8.GetBytes(parameters.ToString());

            //request to server
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://notamweb.aviation-civile.gouv.fr/Script/IHM/Bul_Aerodrome.php");
            req.Method = "POST";                
            req.ContentType = "application/x-www-form-urlencoded";
            req.ContentLength = bytedata.Length;

            Stream reqStream = req.GetRequestStream();
            reqStream.Write(bytedata, 0, bytedata.Length);
            reqStream.Close();
            MessageBox.Show(bytedata.Length.ToString() + " - " + parameters);

            WebResponse response = req.GetResponse();
            var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();

希望您能帮助我解决问题。

Answer 1

示例代码中有很多地方需要改进。您应该查看IDisposable和using块，以确保在您的应用程序使用完资源后正确清理资源。例如，您在关闭请求流之前不会刷新请求流，因此很有可能只有部分请求发送到服务器，从而导致响应500。

HttpRequestMessage类可帮助您手动处理您在此处执行的许多操作，例如对内容进行格式/ URL编码和设置内容标头。请参阅下面的示例。由于您手动编写请求流的方式，我感到您的代码无法正常工作。如果以下方法不能解决问题，则可能是您的请求数据无效。

IEnumerable<KeyValuePair<string, string>> Data = new[] {
    new KeyValuePair<string, string>("bResultat", "true"),
    new KeyValuePair<string, string>("ModeAffichage", "COMPLET"),
    new KeyValuePair<string, string>("bImpression", ""),
    new KeyValuePair<string, string>("AERO_Date_DATE", "2018/10/03"),
    new KeyValuePair<string, string>("AERO_Date_HEURE", "20:50"),
    new KeyValuePair<string, string>("AERO_Langue", "FR"),
    new KeyValuePair<string, string>("AERO_Duree", "12"),
    new KeyValuePair<string, string>("AERO_CM_REGLE", "1"),
    new KeyValuePair<string, string>("AERO_CM_GPS", "2"),
    new KeyValuePair<string, string>("AERO_CM_INFO_COMP", "1"),
    new KeyValuePair<string, string>("AERO_Tab_Aero[0]", "EDDM")
};

HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "http://notamweb.aviation-civile.gouv.fr/Script/IHM/Bul_Aerodrome.php");
request.Content = new FormUrlEncodedContent(Data);

HttpClient cli = new HttpClient();
var response = await cli.SendAsync(request);
var responseText = await response.Content.ReadAsStreamAsync();

Answer 2

只是告诉您我刚刚获得了第一次成功。我收到了对我请求的回复。

我在请求中添加了以下参数：

req.UserAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2";

我的代码如下：

//input html to be field 
            NameValueCollection Data = new NameValueCollection();
            Data.Add("bResultat", "true");
            Data.Add("ModeAffichage", "COMPLET");
            Data.Add("bImpression", "");
            Data.Add("AERO_Date_DATE", "2018/10/04");
            Data.Add("AERO_Date_HEURE", "21:50");
            Data.Add("AERO_Langue", "FR");
            Data.Add("AERO_Duree", "12");
            Data.Add("AERO_CM_REGLE", "1");
            Data.Add("AERO_CM_GPS", "2");
            Data.Add("AERO_CM_INFO_COMP", "1");
            Data.Add("AERO_Tab_Aero[0]", "EDDM");
            Data.Add("AERO_Tab_Aero[1]", "EDDF");
            Data.Add("AERO_Tab_Aero[2]", "EDDL");
            Data.Add("AERO_Tab_Aero[3]", "EDDV");
            Data.Add("AERO_Tab_Aero[4]", "EDDN");

            //Create the data in good format
            var parameters = new StringBuilder();
            foreach (string key in Data.Keys)
            {                    
               parameters.AppendFormat("{0}={1}&",
               System.Web.HttpUtility.UrlEncode(key),
               System.Web.HttpUtility.UrlEncode(Data[key]));
            }
            parameters.Length -= 1;               

            byte[] bytedata = Encoding.UTF8.GetBytes(parameters.ToString());

            //request to server
            HttpWebRequest req =(HttpWebRequest)WebRequest.Create("http://notamweb.aviation-civile.gouv.fr/Script/IHM/Bul_Aerodrome.php");

            req.Method = WebRequestMethods.Http.Post;
            req.UserAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2";
            req.ContentType = "application/x-www-form-urlencoded";
            req.ContentLength = bytedata.Length;

            Stream reqStream = req.GetRequestStream();
            reqStream.Write(bytedata, 0, bytedata.Length);
            reqStream.Close();
            MessageBox.Show(bytedata.Length.ToString() + " - " + parameters);

            WebResponse response = req.GetResponse();
            var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();

我很惊讶地看到Webresponse嵌入了HTML标签。它需要找到一个过滤器来清洁它。 WebResponse from the HttpWebRequest

感谢您的建议

再见我的下一个问题

西里尔

带有html元素的HttpWebRequest-内部伺服错误

2 个答案: