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我刚遇到以下问题：

我需要下载登录页面后面的数据。但是，当我发出 get 请求时，服务器正在提供错误数据 - 内容在那里，但标头集中没有内容长度，它是一个空字段。我用 Fiddler 查找了它，当我尝试用浏览器下载文件时，它也是一样的，但是浏览器完成了下载，而 C# 在从我的请求中获取响应对象时出现异常。

标题如下所示：

HTTP/1.1 200 OK
Date: Sat, 06 Dec 2014 11:55:06 GMT
Server: Apache
Content-Disposition: attachment; filename=;
Pragma: no-cache
Expires: 0
Content-Length: 
X-Powered-By: PleskLin
Connection: close
Content-Type: application/octet-stream

 Hersteller;"Hersteller Art-Nr";"Lieferant Art-Nr";Ma�stab;Bezeichnung;EAN;"EK (netto)";UVP;USt;Verkaufseinheit;Hinweis;"Letzte Pro...

我的代码看起来像这样

    public string ReadPage(string path, string method = "GET"){
        var result = "";
        var request = (HttpWebRequest)WebRequest.Create(path);
        request.Method = method;            
        request.Host = "somehost.de";
        request.CachePolicy = new System.Net.Cache.RequestCachePolicy(System.Net.Cache.RequestCacheLevel.NoCacheNoStore);
        request.Referer = @"http://somehost.de/login.php?redir=list.php%3Ftype%3Dmm";
        request.AllowAutoRedirect = true;
        request.Headers.Add("Cookie", LoginCookie);
        try
        {
        var response = request.GetResponse();           
            using (StreamReader sr = new StreamReader(response.GetResponseStream()))
            {
                result = sr.ReadToEnd();
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
            //throw;
        }
        return result;            
    }

异常出现在该var response = request.GetResponse();行中。知道如何解决这个问题吗？我只想让它继续，让我读出数据。

忘记了异常 - 它是带有消息的 WebException 服务器违反了协议。Section=ResponseHeader Detail='Content-Length' 标头值无效

4

1 回答 1

0

我真的很喜欢Matthew 的回答：.Net HttpWebRequest.GetResponse() 在返回 http 状态代码 400（错误请求）时引发异常

一点点改变

public static class WebRequestExtensions
{
    public static WebResponse GetWEResponse(this WebRequest request)
    {
        if (request == null)
        {
            throw new ArgumentNullException("request");
        }

        try
        {
            return request.GetResponse();
        }
        catch (WebException e)
        {
            return e.Response;
        }
    }
}

您现在可以通过使用request.GetWEResponse

public string ReadPage(string path, string method = "GET") {
    var result = "";
    var request = (HttpWebRequest)WebRequest.Create(path);
    request.Method = method;            
    request.Host = "somehost.de";
    request.CachePolicy = new System.Net.Cache.RequestCachePolicy(System.Net.Cache.RequestCacheLevel.NoCacheNoStore);
    request.Referer = @"http://somehost.de/login.php?redir=list.php%3Ftype%3Dmm";
    request.AllowAutoRedirect = true;
    request.Headers.Add("Cookie", LoginCookie);
    try
    {
        var response = request.GetWEResponse();           
        using (StreamReader sr = new StreamReader(response.GetResponseStream()))
        {
            result = sr.ReadToEnd();
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
        //throw;
    }
    return result;            
}

或更好

public string ReadPage(string path, string method = "GET")
{
    var request = (HttpWebRequest)WebRequest.Create(path);

    request.Method = method;            
    request.Host = "somehost.de";
    request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.NoCacheNoStore);
    request.Referer = @"http://somehost.de/login.php?redir=list.php%3Ftype%3Dmm";
    request.AllowAutoRedirect = true;
    request.Headers.Add("Cookie", LoginCookie);

    using (var response = (HttpWebResponse)request.GetWEResponse())
    using (var reader = new StreamReader(response.GetResponseStream()))
    {
        return reader.ReadToEnd();
    }
}
于 2014-12-06T20:22:04.180 回答