403将URL加载到xdocument时出现禁止错误

问题描述

以下下载RSS文件的代码在我正在整理的应用程序中运行了好几周：



公共类RssFeedReader

{

public IEnumerable< post> ;; ReadFeed（string url）

{

var rssFeed = XDocument.Load（url）;



var posts =来自rssFeed.Descendants（item）中的项目

选择新帖子

{

Title = item.Element（title）.Value，

描述= item.Element（描述）.Value，

// PublishedDate = item.Element（.Value};



返回帖子;

}

}

url在我正在使用的测试用例中是

http://www.news.com.au/national/rss



我得到的回复是：

异常抛出：System.dll中的System.Net.WebException

和



附加信息：远程服务器返回错误：（403 ）禁止。



System.Net.WebException occurre d

HResult = -2146233079

消息=远程服务器返回错误：（403）禁止。

来源=系统

StackTrace：at System.Net.HttpWebRequest.GetResponse（）

InnerException：



如上所述，这一切都运作得非常顺利直到3天前，然后停止工作没有明显的原因..我已经到处寻找答案，并尝试了各种事情，如直接加载到XDocument等 - 但它仍然给出相同或类似的错误。



我拿了那段代码片段，没有对它做任何改动，写了一个调用它的小程序。我使用完全相同的网址 - 它工作正常！



那么主程序中的配置是否正确？



非常感谢任何帮助！



我尝试过：



除此之外，我把这个块放在'var rssFeed'前面并运行它：



WebClient webClient = new WebClient（）;

webClient.Headers.Add（user-agent，MyRSSReader / 1.0;）;



XmlReader readers = XmlReader.Create（webClient.OpenRead （url））;

var xmlDocument = new XmlDocument（）;

xmlDocument.Load（readers）;





并且尝试运行xmlDocument.Load（读者）时出现完全相同的403错误。



我在CodeProject上读到了关于403错误的一些建议，并尝试使用https而不仅仅是http： - 它因为不同（但可以理解）原因而失败：



异常抛出：System.dll中的System.Security.Authentication.AuthenticationException



附加信息：根据验证，远程证书无效过程。

The following code to download an RSS file was working perfectly for weeks in an application I'm putting together:

public class RssFeedReader
{
public IEnumerable<post>; ReadFeed(string url)
{
var rssFeed = XDocument.Load(url);

var posts = from item in rssFeed.Descendants(item)
select new Post
{
Title = item.Element(title).Value,
Description = item.Element(description).Value,
// PublishedDate = item.Element(.Value};

return posts;
}
}
url in the test case I'm using is
http://www.news.com.au/national/rss

The response I'm getting is:
"Exception thrown: System.Net.WebException in System.dll "
and

"Additional information: The remote server returned an error: (403) Forbidden."

System.Net.WebException occurred
HResult=-2146233079
Message=The remote server returned an error: (403) Forbidden.
Source=System
StackTrace: at System.Net.HttpWebRequest.GetResponse()
InnerException:

As mentioned this was all working so smoothly up until 3 days ago then stopped working for no apparent reason.. I've looked all over the place for an answer and tried various things like loading directly into an XDocument etc - but it still gives the same or similar error.

I took that code snippet, made no changes to it and wrote a small program b that calls it. I used exactly the same url - and it works fine!

So could it be something is configured incorrectly in the main program?

Any help very much appreciated!

What I have tried:

Amongst other things, I put this block in front of 'var rssFeed' and ran it:

WebClient webClient = new WebClient();
webClient.Headers.Add( user-agent , MyRSSReader/1.0 ;);

XmlReader readers = XmlReader.Create(webClient.OpenRead(url));
var xmlDocument = new XmlDocument();
xmlDocument.Load(readers);


and got exactly the same 403 error as it tried to run "xmlDocument.Load(readers); "

I read some suggestions on CodeProject about the 403 error and tried using https instead of just http: - it failed for a diffeet (but understandable) reason:

Exception thrown: System.Security.Authentication.AuthenticationException in System.dll

Additional information: The remote certificate is invalid according to the validation procedure.

推荐答案

static XDocument LoadRss(string url)
{
    var request = (HttpWebRequest)WebRequest.Create(url);
    request.UserAgent = "(Anything other than an empty string)";

    using (var response = request.GetResponse())
    using (var stream = response.GetResponseStream())
    {
        return XDocument.Load(stream);
    }
}

public IEnumerable<Post> ReadFeed(string url)
{
    var rssFeed = LoadRss(url);
    ...

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