为什么我会收到错误“底层连接已关闭” 当获取图像时？
我正在使用一些代码来获取给定 URL 的图像，它对我尝试过的所有 URL 都有效，除了一个：
http://title.mximg.com/img/logo/bizrealty.com.gif
对于此 URL，我收到“底层连接已关闭：接收时发生意外错误” ”。
但是，如果您使用浏览器打开该 URL，它会完美加载。
显然该错误消息的含义是：
“底层连接已关闭： 发生意外错误 接收。”
--当客户端发送完整的请求并获得 TCP 时看到 来自服务器的 ACK-FIN 或 RST 关闭 连接，无响应 来自服务器。
但我不知道这意味着什么:-(
代码很简单：
Dim req As System.Net.HttpWebRequest = DirectCast(WebRequest.Create(ImageURL), HttpWebRequest)
req.Method = "GET"
Dim resp As Net.HttpWebResponse = DirectCast(req.GetResponse(), Net.HttpWebResponse)
更新：将 KeepAlive 设置为 false 没有帮助。另外，这不是超时问题，我很快就收到错误。
知道可能是什么发生什么事了？
谢谢！
I'm using a little code to grab an image given its URL, and it's working for me for all URLs I tried except one:
http://title.mximg.com/img/logo/bizrealty.com.gif
For this URL, I'm getting "The underlying connection was closed: An unexpected error occurred on a receive."
However, if you open that URL with a browser, it loads perfectly.
Apparently that error message means:
"The underlying connection was closed:
An unexpected error occurred on a
receive."
--Seen when the client had sent the request in its entirety and got a TCP
ACK-FIN or RST from server to close
the connection, without a response
from server.
But I have no idea what that means :-(
The code is simply:
Dim req As System.Net.HttpWebRequest = DirectCast(WebRequest.Create(ImageURL), HttpWebRequest)
req.Method = "GET"
Dim resp As Net.HttpWebResponse = DirectCast(req.GetResponse(), Net.HttpWebResponse)
UPDATE: Setting KeepAlive to false doesn't help it. Also, it's not a timeout issue, I'm getting the error quite fast.
Any idea what could be going on?
Thanks!
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我会尝试更新您的请求设置，例如 UserAgent 或接受。 他们可能会动态提供图像并拒绝看起来不像正常流量的请求。
I'd try updating your request settings like UserAgent or Accept. It's possible they're serving images dynamically and reject requests that don't look like normal traffic.