httpwebresponse does not work

Question

我试图以编程方式搜索上述网站上的项目。

以下不适合我。响应实际上是一个错误页面，而不是搜索结果页面。

请帮忙。

 string sUrl = "http://www.arrownac.com/"; 
     string sUrl1 = "http://app.arrownac.com/aws/pg_webc?s=P"; 

     HttpWebRequest owebreq = (HttpWebRequest)WebRequest.Create(sUrl1); 
     owebreq.Referer = sUrl;   

     ASCIIEncoding encoding = new ASCIIEncoding(); 

     string postdata = "search_token=" + "743C083102JPTR"; 
     byte[] data = encoding.GetBytes(postdata); 

     owebreq.ContentType = "text/html"; 
      //"application/x-www-form-urlencoded"; 

     owebreq.Method = "POST"; 
     owebreq.ContentLength = data.Length; 
     Stream newStream = owebreq.GetRequestStream(); 
     newStream.Write(data, 0, data.Length); 
     newStream.Close();   

     HttpWebResponse owebresp = (HttpWebResponse)owebreq.GetResponse(); 
     string sResult = string.Empty; 
     using (StreamReader sr = new StreamReader(owebresp.GetResponseStream())) 
     { 
      sResult = sr.ReadToEnd(); 
      sr.Close(); 
     } 

Answer 1

你可能不发送请求正是的网站预计它。我会做到以下几点：

 
1) use firefox. 
2) install firebug plugin 
3) use firefox to execute your scenario. 
4) Look at the actual requests sent from firefox (use the firebug plugin for that) 
5) Now, duplicate the exact same requests, down to the user-agent,cookies and request headers in code. 
6) profit? 

Answer 2

为什么写了这么多的代码时，它可以是简单的：

class Program 
{ 
    static void Main() 
    { 
     using (var client = new WebClient()) 
     { 
      var referer = "http://www.arrownac.com/"; 
      client.Headers[HttpRequestHeader.Referer] = referer;     
      var valuesToPost = new NameValueCollection 
      { 
       { "search_token", "743C083102JPTR" }, 
      }; 
      var url = "http://app.arrownac.com/aws/pg_webc?s=P"; 
      var result = client.UploadValues(url, valuesToPost); 
      var resultString = Encoding.Default.GetString(result); 
      Console.WriteLine(resultString); 
     } 
    } 
}