.net downloadstring(url) 突然返回 503 错误

发布于 2024-11-17 14:05:14 字数 376 浏览 6 评论 0原文

我有一个简单的函数来抓取一个网页，该网页突然从特定页面的以下代码中收到 503 错误：

try
{
  WebClient client = new WebClient();
  client.Proxy = null;
  string webhtml = client.DownloadString(strURL);
  client.Dispose();
  return (webhtml);
}

当我在 IE 或 FF 中输入该 url 时，该 url 有效，但当此代码运行时它返回错误。其他网址工作正常。我猜想来自 .net 的 http 请求与来自任一浏览器的 http 请求有所不同。有没有办法更好地模拟基于浏览器的http请求？

谢谢。

原文

I have a simple function to scrape a web page that is suddenly getting a 503 error from the following code for a specific page:

try
{
  WebClient client = new WebClient();
  client.Proxy = null;
  string webhtml = client.DownloadString(strURL);
  client.Dispose();
  return (webhtml);
}

The url works when I enter it in IE or FF but it's returning an error when this code runs. Other urls work fine. I'm guessing there is something different about the http request from .net than from either of the browsers. Is there any way to better emulate a browser-based http request?

Thanks.

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