c# - "A connection attempt failed because the connected party did not properly respond after a period of time"使用 WebClient

Question

我正在使用以下在本地计算机上运行的代码，但是当我在服务器上尝试相同的代码时，它会抛出错误

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond

这是我的代码:

WebClient client = new WebClient();
// Add a user agent header in case the 
// requested URI contains a query.
//client.Headers.Add ("ID", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");
Stream data = client.OpenRead("http://" + Request.ServerVariables["HTTP_HOST"] + Request.ApplicationPath + "/PageDetails.aspx?ModuleID=" + ID);
StreamReader reader = new StreamReader(data);
string s = reader.ReadToEnd();
Console.WriteLine(s);
data.Close();
reader.Close();

我在

上遇到错误

Stream data = client.OpenRead("http://" + Request.ServerVariables["HTTP_HOST"] + Request.ApplicationPath + "/PageDetails.aspx?ModuleID=" + ID);

是否是由于防火墙设置所致？

Answer 1

我遇到了类似的问题，必须使用以下方法将 URL 从字符串转换为 Uri 对象:

Uri myUri = new Uri(URLInStringFormat, UriKind.Absolute);

(URLInStringFormat 是您的 URL) 尝试使用 Uri 而不是字符串进行连接:

WebClient client = new WebClient();
client.OpenRead(myUri);