HttpWeb请求错误403

我是 C# 新手，需要从 C# 检索 url。大多数情况下它工作正常，但在一种情况下它会抛出错误。网址如下http://whois.afrinic.net/cgi-bin/whois?searchtext=41.132.178.138 http://whois.afrinic.net/cgi-bin/whois?searchtext=41.132.178.138

错误是：

HTTP 请求 url 时出现异常：http://whois.afrinic.net/cgi-bin/whois?searchtext=41.132.178.138 http://whois.afrinic.net/cgi-bin/whois?searchtext=41.132.178.138远程服务器返回错误：(403) 禁止。

我的代码是

void MyFUnction(string url)
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

    request.UserAgent = ".NET Framework Test Client";
    request.ContentType = "application/x-www-form-urlencoded";
    Logger.WriteMyLog("application/x-www-form-urlencoded");


    // execute the request
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
    // we will read data via the response stream
    Stream resStream = response.GetResponseStream();

    string tempString = null;
    int count = 0;
    do
    {
        // fill the buffer with data
        count = resStream.Read(buf, 0, buf.Length);

        // make sure we read some data
        if (count != 0)
        {
            // translate from bytes to ASCII text
            tempString = Encoding.ASCII.GetString(buf, 0, count);
            if (httpData == null)
                httpData = tempString;
            else
                httpData += tempString;

        }
    }
    while (count > 0); // any more data to read?
}

删除您的 ContentType 行。

request.ContentType....

您没有进行表单发布，只是使用“GET”检索页面。

request.Method = "GET"; //this is the default behavior

并将 Accept 属性设置为“text/html”。

request.Accept = "text/html";