C# 发送 POST 请求并接收 303 状态码

Question

我正在编写连接到网页并从文档正文接收特定数据的简单应用程序。

我是这样发送HttpWebRequest的：

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://webpage.com/page1.php");
request.Method = "POST";
string postData = "some_post_data";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentType = "application/x-www-form-urlencoded";
request.Referer = "http://webpage.com/";
request.ContentLength = byteArray.Length;
request.CookieContainer = new CookieContainer();
request.UserAgent = "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31";
request.Headers.Add("Cookie", string.Format("sess_id={0}", UserInfo.SessionId));
request.Headers.Add("Accept-Charset", "ISO-8859-2,utf-8;q=0.7,*;q=0.3");
request.Headers.Add("Accept-Language", "pl-PL,pl;q=0.8,en-US;q=0.6,en;q=0.4");
request.Headers.Add("Accept-Encoding", "gzip");
request.AutomaticDecompression = DecompressionMethods.GZip;

Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close(); // *** [1] ***

HttpWebResponse response = (HttpWebResponse)request.GetResponse(); // *** [2] ***
dataStream = response.GetResponseStream();
response.Close();

StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();

很好！请求没问题，没有什么神奇的。关键是，在dataStream.Close();（第 [1] 行）之后，我收到 303 状态代码，这意味着将重定向到另一个页面。当我阅读点 [2] 的响应时，我看到了新的（重定向的）页面。

我想要的只是在重定向之前阅读标题。到底有没有可能？

Answer 1

在调用GetResponse之前，将request的AllowAutoRedirect属性设置为false。

request.AllowAutoRedirect = false;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();

More information.