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偶尔会遇到“尝试尝试重定向太多”的例外情况。尝试使用WebRequest尝试抓取网页的HTML时,尝试使用WebRequest尝试使用太多重定向
这样的网站的一个例子是http://www.magicshineuk.co.uk/
通常我会设置超时时间为像6秒......但即使有30秒,最大重定向允许一些疯狂喜欢200,它仍然会抛出“太多重定向”异常,或者会发生超时。
我该如何解决这个问题?
我的代码如下...
try
{
System.Net.WebRequest request = System.Net.WebRequest.Create("http://www.magicshineuk.co.uk/");
var hwr = ((HttpWebRequest)request);
hwr.UserAgent ="Mozilla/5.0 (Windows NT 10.0; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0";
hwr.Headers.Add("Accept-Language", "en-US,en;q=0.5");
hwr.Headers.Add("Accept-Encoding", "gzip, deflate");
hwr.ContentType = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"; ;
hwr.KeepAlive = true;
hwr.Timeout = 30000; // 30 seconds... normally set to 6000
hwr.Method = "GET";
hwr.AllowAutoRedirect = true;
hwr.CookieContainer = new System.Net.CookieContainer();
// Setting this Makes no difference... normally I would like to keep to a sensible maximum but I will leave as the default of 50 if needs be...
// Either way, the Too Many Redirections exception occurs
hwr.MaximumAutomaticRedirections = 200;
using (var response = (HttpWebResponse)hwr.GetResponse())
{
Console.WriteLine(String.Format("{0} {1}", (int)response.StatusCode, response.StatusCode));
Console.WriteLine(response.ResponseUri);
Console.WriteLine("Last modified: {0}", response.LastModified);
Console.WriteLine("Server: {0}", response.Server);
Console.WriteLine("Supports Headers: {0}", response.SupportsHeaders);
Console.WriteLine("Headers: ");
// do something... e.g:
int keyCount = response.Headers.Keys.Count;
int i = 0;
Dictionary<string, string> hc = new Dictionary<string, string>();
foreach (var hname in response.Headers)
{
var hv = response.Headers[i].ToString();
hc.Add(hname.ToString(), hv);
i++;
}
foreach (var di in hc)
{
Console.WriteLine(" {0} = {1}", di.Key, di.Value);
}
}
}
catch (Exception ex)
{
Console.WriteLine("Exception: ");
Console.WriteLine(ex.Message);
}
我的错。你删除的线是罪魁祸首!我的函数“GetSimpleUrl(url)”返回“magicshineuk.co.uk”,因此重定向是因为主机在请求发生前被设置。代码现在实际运行良好。 – collumbo
为了记录,我删除了行hwr.Host = Utils.GetSimpleUrl(url);以避免混淆。这些代码现在适合其他人使用。 – collumbo
FTW!很高兴现在排序。 –