我正在尝试使用 HttpWebRequest 验证 Url 是否存在。我找到了几个基本上可以做到这一点的例子:
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(Url);
request.Method = "HEAD";
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
return response.StatusCode;
}
但是,如果 url 确实损坏了,它不会返回响应,而是抛出异常。
我修改了我的代码:
try
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(Url);
request.Method = "HEAD";
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
return response.StatusCode;
}
}
catch (System.Net.WebException ex)
{
var response = ex.Response as HttpWebResponse;
return response == null ? HttpStatusCode.InternalServerError : response.StatusCode;
}
这似乎终于做了我想做的事。
但我想知道,为什么请求会抛出异常,而不是返回带有 NotFound 状态码的响应?
最佳答案
是的,当网页大量使用状态代码并且并非所有状态代码都是错误时,这可能会非常烦人。这会使处理 body 变得非常痛苦。我个人使用此扩展方法来获取响应。
public static class HttpWebResponseExt
{
public static HttpWebResponse GetResponseNoException(this HttpWebRequest req)
{
try
{
return (HttpWebResponse)req.GetResponse();
}
catch (WebException we)
{
var resp = we.Response as HttpWebResponse;
if (resp == null)
throw;
return resp;
}
}
}
关于c# - 为什么 HttpWebRequest 抛出异常而不是返回 HttpStatusCode.NotFound?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10081726/