500使用HttpWebRequest时出现内部服务器错误,如何获得真正的错误? [英] 500 Internal Server Error when using HttpWebRequest, how can I get to the real error?
问题描述
我正在尝试改善所提供的信息,以应对应用程序内处理的错误.
I'm trying to improve the information provided in response to an error handled within an app.
这是代码:
Try
httpRequestObj = HttpWebRequest.Create(strRequest)
httpRequestObj.Method = "GET"
httpRequestObj.UseDefaultCredentials = True
* httpResponse = httpRequestObj.GetResponse
Using reader As StreamReader = New StreamReader(httpResponse.GetResponseStream())
strXML = reader.ReadToEnd()
End Using
Catch ex As WebException
'do something with ex
End Try
在*行上抛出了webexception
The webexception is thrown on the * line
当前,我在异常中看到的全部是远程服务器返回错误:(500)内部服务器错误".我已经在调试中查看了异常,但是所需的信息却不存在-我想需要读取响应才能看到该信息,但它永远不会走那么远.
Currently all I see in the Exception is "The remote server returned an error: (500) Internal Server Error". I've looked at the exception in debug but the info I need isn't there- I guess the response would need to be read in to see that info but it never gets that far.
如果我接受请求并将其直接粘贴到浏览器中,则可以看到我正在调用的API返回的XML格式的错误详细信息,
If I take the request and paste it into my browser directly I can see the error details in XML format that is returned from the API I'm calling, info like:
<Error>
<description>info I want to get to here</description>
<detail />
<code>info I want to get to here</code>
<source />
<category>info I want to get to here</category>
<file>info I want to get to here</file>
<line>info I want to get to here</line>
<pad />
</Error>
有什么办法可以更改此代码,以便克服500错误并查看实际响应,我希望能够解析此xml来找出失败的真正问题.
Is there any way I can change this code so that I can get past the 500 error and see the actual response, I'd like to be able to parse this xml to find out the real problem for the failure.
注意:异常确实有一个ex.Response(System.Net.HttpWebResponse),但我在那里看不到我需要的信息,只有一堆Header信息.
Note: the Exception does have an ex.Response (System.Net.HttpWebResponse), but I can't see the info I need in there, only a load of Header info.
推荐答案
您可以从异常中获取错误响应....
You can get the error response from the exception....
try
{
....
} catch(Exception e) {
if (e is WebException && ((WebException)e).Status==WebExceptionStatus.ProtocolError)
{
WebResponse errResp = ((WebException)e).Response;
using(Stream respStream = errResp.GetResponseStream())
{
// read the error response
}
}
}
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