HttpWebRequest.GetResponse对HTTP 304抛出WebException
问题描述：
当Web服务器响应 HttpWebRequest.GetResponse（）用HTTP 304（未修改），的GetResponse（） thows一个 WebException ，这实在是太令人不可思议了我。这是通过设计还是我缺少明显的东西在这里？
When a web server responds to HttpWebRequest.GetResponse() with HTTP 304 (Not Modified), GetResponse() thows a WebException, which is so very weird to me. Is this by design or am I missing something obvious here?
答
好了，这似乎是一个被设计的行为和的vexing例外。这可以用此来解决：
Ok, this seems to be a by-design behavior and a perfect example of a vexing exception. This can be solved with this:
public static HttpWebResponse GetHttpResponse(this HttpWebRequest request)
{
try
{
return (HttpWebResponse) request.GetResponse();
}
catch (WebException ex)
{
if(ex.Response == null || ex.Status != WebExceptionStatus.ProtocolError)
throw;
return (HttpWebResponse)ex.Response;
}
}