.Net HttpWebRequest 获取请求返回 WebException

Question

尝试创建两次获取请求。然而，第二个请求总是抛出 WebException 并显示消息：“底层连接已关闭：连接已意外关闭。”

这是我使用的代码spinet

public string Get(string url)
    {
        string strResult = "";
        try
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.CookieContainer = new CookieContainer();
            request.UserAgent = this.UserAgent;
            request.KeepAlive = false;

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream stream = response.GetResponseStream();
            StreamReader reader = new StreamReader(stream, Encoding.UTF8);
            strResult = reader.ReadToEnd();
            response.Close();
        }
        catch (Exception ex)
        {
            //Todo
        }
        return strResult;
    }

我请求这个url

如果我启动提琴手似乎第二个请求正常工作。 如果我使用 HttpClient 类，它似乎也可以。

Answer 1

当您启动 fiddler 时，请求之间是否有任何延迟（您是否在中间遇到断点）。也许在您的通话之间添加一个快速的Thread.Sleep(250);。

另外一点，添加一些 using 语句来关闭一次性类。

try {
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
    request.Method = "GET";
    request.CookieContainer = new CookieContainer();
    request.UserAgent = this.UserAgent;
    request.KeepAlive = false;

    using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
    using (Stream stream = response.GetResponseStream())
    using (StreamReader reader = new StreamReader(stream, Encoding.UTF8)) { 
        strResult = reader.ReadToEnd();
        response.Close();
}