如何从 powershell 请求的 404 页面获得响应 [英] How do you get the response from a 404 page requested from powershell

问题描述

我必须调用 TeamCity 公开的 API，它会告诉我用户是否存在.API 网址是这样的:http://myteamcityserver.com:8080/httpAuth/app/rest/users/猴子

I have to call an API exposed by TeamCity that will tell me whether a user exists. The API url is this: http://myteamcityserver.com:8080/httpAuth/app/rest/users/monkey

当从浏览器(或提琴手)调用时，我得到以下回复:

When called from the browser (or fiddler), I get the following back:

Error has occurred during request processing (Not Found).
Error: jetbrains.buildServer.server.rest.errors.NotFoundException: No user can be found by username 'monkey'.
Could not find the entity requested. Check the reference is correct and the user has permissions to access the entity.

我必须使用 powershell 调用 API.当我这样做时，我得到一个例外，我没有看到上面的文字.这是我使用的powershell:

I have to call the API using powershell. When I do it I get an exception and I don't see the text above. This is the powershell I use:

try{
    $client = New-Object System.Net.WebClient
    $client.Credentials = New-Object System.Net.NetworkCredential $TeamCityAgentUserName, $TeamCityAgentPassword
    $teamCityUser = $client.DownloadString($url)
    return $teamCityUser
}
catch
{
    $exceptionDetails = $_.Exception
    Write-Host "$exceptionDetails" -foregroundcolor "red"
}

例外:

System.Management.Automation.MethodInvocationException: Exception calling "DownloadString" with "1" argument(s): "The remote server returned an error: (404) Not Found." ---> System.Net.WebException: The remote server returned an error: (404) Not Found.
   at System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request)
   at System.Net.WebClient.DownloadString(Uri address)
   at CallSite.Target(Closure , CallSite , Object , Object )
   --- End of inner exception stack trace ---
   at System.Management.Automation.ExceptionHandlingOps.CheckActionPreference(FunctionContext funcContext, Exception exception)
   at System.Management.Automation.Interpreter.ActionCallInstruction`2.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)
   at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(InterpretedFrame frame)

我需要能够检查返回的页面是否包含上述文本.这样我就知道是否应该自动创建一个新用户.我可以只检查 404，但我担心的是，如果 API 被更改并且调用真的返回 404，那么我就不会更聪明了.

I need to be able to check that the page is returned contains the text described above. This way I know whether I should create a new user automatically or not. I could just check for 404, but my fear is that if the API is changed and the call really returns a 404, then I would be none the wiser.

推荐答案

更改 catch 子句以捕获更具体的 WebException，那么你可以使用它的Response属性来获取状态码:

Change your catch clause to catch the more specific WebException, then you can use the Response property on it to get the status code:

{
  #...
} 
catch [System.Net.WebException] 
{
    $statusCode = [int]$_.Exception.Response.StatusCode
    $html = $_.Exception.Response.StatusDescription
}

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