System.Net.HttpWebResponse.GetResponseStream() 在 WebException 中返回截断的正文

Question

由于某种超出我理解的原因，向特定网站提出请求 (https://learningnetwork.cisco .com/people/mrollins?view=profile）会生成一个 reqsponse 对象，其响应流包含网站的中继版本。

该流在 65536 字节后结束，相当于 2^16 字节。我认为这是一个可疑的整数。这些请求抱怨内部服务器错误，我对此表示抑制，因为我已经验证了网络浏览器能够理解此响应，并且完整的 html 包含在服务器的响应中。 （使用fiddler）

我发现了之前记录的问题此处，这并不令人满意，原因很简单，它在此注释上结束：

“我想我必须希望这个错误 不超过 65536 个字符..."

嗯，确实如此。

解决方法表示赞赏，或者如果有人知道即将推出的修复程序也很好。

using System;
using System.IO;
using System.Net;
using System.Web.UI;

namespace Example
{
    public partial class _Default : Page
    {
        protected void Page_Load(object senderHidden, EventArgs eHidden)
        {
            //ServicePointManager.ServerCertificateValidationCallback += delegate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true; };
            var cookieContainer = new CookieContainer();
            //Encoding enc = Encoding.UTF8;
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create("https://learningnetwork.cisco.com/people/mrollins?view=profile");
            req.AllowAutoRedirect = false;

            req.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
            req.CookieContainer = cookieContainer;
            req.Accept = "text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5";
            req.Method = "GET";
            req.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.8.1.12) Gecko/20080201 Firefox/2.0.0.12";
            req.KeepAlive = true;

            HttpWebResponse resp = null;
            try
            {
                resp = (HttpWebResponse)req.GetResponse();
            }
            catch (WebException e)
            {
                var r = e.Response as HttpWebResponse;
                var memstream = Read(r.GetResponseStream());
                var wrongLength = memstream.Length;
            }
        }

        public static MemoryStream Read(Stream stream)
        {
            MemoryStream memStream = new MemoryStream();

            byte[] readBuffer = new byte[4096];
            int bytesRead;
            while ((bytesRead = stream.Read(readBuffer, 0, readBuffer.Length)) > 0)
                memStream.Write(readBuffer, 0, bytesRead);
            return memStream;
        }
    }
}

Answer 1

HttpWebRequest 有一个静态属性，可以限制 Web 请求的长度。在发出请求之前插入这行代码可以解决问题。

HttpWebRequest.DefaultMaximumErrorResponseLength = 1048576;