c# – 错误请求400 – 有效URL上的协议错误 – Webclient

发布时间：2020-12-16 00:24:02 所属栏目：百科来源：网络整理

导读：我正在尝试解析此页面( http://www.coleparmer.co.uk/Product/Turb_Std_Hach_2100q_Kit/WZ-99900-47) ?使用webclient,我没有运气. var client = new WebClient(); var html = client.DownloadString("http://www.coleparmer.co.uk/Product/Turb_Std_Hach_210

我正在尝试解析此页面( http://www.coleparmer.co.uk/Product/Turb_Std_Hach_2100q_Kit/WZ-99900-47)
?使用webclient,我没有运气.

var client = new WebClient();
  var html = client.DownloadString("http://www.coleparmer.co.uk/Product/Turb_Std_Hach_2100q_Kit/WZ-99900-47");

解决方法

需要设置适当的标头.

try
{
    string html;
    using (WebClient client = new WebClient())
    {
        client.Headers.Add("Accept-Language"," en-US");
        client.Headers.Add("Accept"," text/html,application/xhtml+xml,*/*");
        client.Headers.Add("User-Agent","Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)");
        html = client.DownloadString("http://www.coleparmer.co.uk/Product/Turb_Std_Hach_2100q_Kit/WZ-99900-47");
    }
}
catch (WebException ex)
{
    if (ex.Status == WebExceptionStatus.ProtocolError && ex.Response != null)
    {
        var resp = (HttpWebResponse)ex.Response;
        if (resp.StatusCode == HttpStatusCode.NotFound) // HTTP 404
        {
            //Handle it
        }
    }
    //Handle it
}

（编辑：李大同）

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