C# 如何从 URL 获取服务器错误？

发布于 2024-09-26 03:19:09 字数 454 浏览 10 评论 0原文

我们有一个 url，我们需要检查网页是否处于活动状态。我们尝试了以下代码： WebResponse objResponse = null;

        WebRequest objRequest = HttpWebRequest.Create(URL);
        objRequest.Method = "HEAD";
        try
        {
            objResponse = objRequest.GetResponse();
            objResponse.Close();                
        }
        catch (Exception ex)
        {

        }

如果无法获得响应，上面的代码会给出异常，但即使我们在该页面上出现“服务器错误”，也可以正常工作？有什么帮助如何获取服务器错误吗？

原文

We have a url and we need to check whether web page is active or not. We tried following code:
WebResponse objResponse = null;

        WebRequest objRequest = HttpWebRequest.Create(URL);
        objRequest.Method = "HEAD";
        try
        {
            objResponse = objRequest.GetResponse();
            objResponse.Close();                
        }
        catch (Exception ex)
        {

        }

Above code gave exception if unable to get a response but also works fine even if we have a "server error" on that page? Any help how to get server error?

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吹梦到西洲 2024-10-03 03:19:09

HttpResponse 类有一个 StatusCode 属性，您可以检查该属性。如果是200就一切正常了。

您可以将代码更改为：

        HttpWebResponse objResponse = null;
        var objRequest = HttpWebRequest.Create("http://google.com"); 
        objResponse = (HttpWebResponse) objRequest.GetResponse();
        if(objResponse.StatusCode != HttpStatusCode.OK)
        {
            Console.WriteLine("It failed");
        }else{
            Console.WriteLine("It worked");
        }

The HttpResponse class has a StatusCode property which you can check. If it's 200 everything is ok.

You can change your code to this:

        HttpWebResponse objResponse = null;
        var objRequest = HttpWebRequest.Create("http://google.com"); 
        objResponse = (HttpWebResponse) objRequest.GetResponse();
        if(objResponse.StatusCode != HttpStatusCode.OK)
        {
            Console.WriteLine("It failed");
        }else{
            Console.WriteLine("It worked");
        }

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哑 2024-10-03 03:19:09

一方面，在响应上使用 using 语句 - 这样无论发生什么，您都可以处理它。

现在，如果抛出 WebException，您可以捕获它并查看 WebException.Response 以找出状态代码和发送回的任何数据：

WebRequest request = WebRequest.Create(URL);
request.Method = "HEAD";
try
{
    using (WebResponse response = request.GetResponse())
    {
        // Use data for success case
    }
}
catch (WebException ex)
{
    HttpWebResponse errorResponse = (HttpWebResponse) ex.Response;
    HttpStatusCode status = errorResponse.StatusCode;
    // etc
}

For one thing, use a using statement on the response - that way you'll dispose of it whatever happens.

Now, if a WebException is thrown, you can catch that and look at WebException.Response to find out the status code and any data sent back:

WebRequest request = WebRequest.Create(URL);
request.Method = "HEAD";
try
{
    using (WebResponse response = request.GetResponse())
    {
        // Use data for success case
    }
}
catch (WebException ex)
{
    HttpWebResponse errorResponse = (HttpWebResponse) ex.Response;
    HttpStatusCode status = errorResponse.StatusCode;
    // etc
}

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