我必须调用TeamCity公开的API，它将告诉我用户是否存在。API的url是:http://myteamcityserver.com:8080/httpAuth/app/rest/users/monkey
当从浏览器(或fiddler)调用时，我得到以下返回:
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，我得到一个异常，我看不到上面的文本。这是我使用的powershell:
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，调用真的返回404，那么我将不知道。
更改catch子句以捕获更具体的WebException，然后您可以在其上使用Response属性以获得状态代码:
{
#...
}
catch [System.Net.WebException]
{
$statusCode = [int]$_.Exception.Response.StatusCode
$html = $_.Exception.Response.StatusDescription
}
BrokenGlass给出了答案，但这可能有所帮助:
try
{
$URI='http://8bit-museum.de/notfound.htm'
$HTTP_Request = [System.Net.WebRequest]::Create($URI)
"check: $URI"
$HTTP_Response = $HTTP_Request.GetResponse()
# We then get the HTTP code as an integer.
$HTTP_Status = [int]$HTTP_Response.StatusCode
}
catch [System.Net.WebException]
{
$statusCode = [int]$_.Exception.Response.StatusCode
$statusCode
$html = $_.Exception.Response.StatusDescription
$html
}
$HTTP_Response.Close()
反应:检查:http://8bit-museum.de/notfound.htm404没有找到
另一种方法:
$URI='http://8bit-museum.de/notfound.htm'
try {
$HttpWebResponse = $null;
$HttpWebRequest = [System.Net.HttpWebRequest]::Create("$URI");
$HttpWebResponse = $HttpWebRequest.GetResponse();
if ($HttpWebResponse) {
Write-Host -Object $HttpWebResponse.StatusCode.value__;
Write-Host -Object $HttpWebResponse.GetResponseHeader("X-Detailed-Error");
}
}
catch {
$ErrorMessage = $Error[0].Exception.ErrorRecord.Exception.Message;
$Matched = ($ErrorMessage -match '[0-9]{3}')
if ($Matched) {
Write-Host -Object ('HTTP status code was {0} ({1})' -f $HttpStatusCode, $matches.0);
}
else {
Write-Host -Object $ErrorMessage;
}
$HttpWebResponse = $Error[0].Exception.InnerException.Response;
$HttpWebResponse.GetResponseHeader("X-Detailed-Error");
}
如果我理解这个问题，那么$ErrorMessage = $Error[0]. exception . errorrecord . exception。Message包含您正在查找的错误消息。(来源:System.Net.HttpWebRequest::GetResponse()中的错误处理)
又一个简单的例子，希望对大家有所帮助:
BEGIN
{
# set an object to store results
$queries = New-Object System.Collections.ArrayList
Function Test-Website($Site)
{
try
{
# check the Site param passed in
$request = Invoke-WebRequest -Uri $Site
}
catch [System.Net.WebException] # web exception
{
# if a 404
if([int]$_.Exception.Response.StatusCode -eq 404)
{
$request = [PSCustomObject]@{Site=$site;ReturnCode=[int]$_.Exception.Response.StatusCode}
}
else
{
# set a variable to set a value available to automate with later
$request = [PSCustomObject]@{Site=$site;ReturnCode='another_thing'}
}
}
catch
{
# available to automate with later
$request = [PSCustomObject]@{Site=$site;ReturnCode='request_failure'}
}
# if successful as an invocation and has
# a StatusCode property
if($request.StatusCode)
{
$siteURI = $Site
$response = $request.StatusCode
}
else
{
$response = $request.ReturnCode
}
# return the data
return [PSCustomObject]@{Site=$Site;Response=$response}
}
}
PROCESS
{
# test all the things
$nullTest = Test-Website -Site 'http://www.Idontexist.meh'
$nonNullTest = Test-Website -Site 'https://www.stackoverflow.com'
$404Test = Test-Website -Site 'https://www.stackoverflow.com/thispagedoesnotexist'
# add all the things to results
$queries.Add($nullTest) | Out-Null
$queries.Add($nonNullTest) | Out-Null
$queries.Add($404Test) | Out-Null
# show the info
$queries | Format-Table
}
END{}
Site Response
---- --------
http://www.Idontexist.meh another_thing
https://www.stackoverflow.com 200
https://www.stackoverflow.com/thispagedoesnotexist 404
您可以尝试使用Internet Explorer COM对象代替。它允许您检查浏览器返回代码并导航HTML对象模型。
注意:我发现你需要在一个提升的PowerShell提示符下运行这个命令，以维护COM对象的定义。
$url = "http://myteamcityserver.com:8080/httpAuth/app/rest/users/monkey"
$ie = New-Object -ComObject InternetExplorer.Application
添加到查看浏览器
$ie.visibility = $true
导航到站点
$ie.navigate($url)
这将暂停脚本直到页面完全加载
do { start-sleep -Milliseconds 250 } until ($ie.ReadyState -eq 4)
然后验证你的URL以确保它不是一个错误页面
if ($ie.document.url -ne $url) {
Write-Host "Site Failed to Load" -ForegroundColor "RED"
} else {
[Retrieve and Return Data]
}
你可以通过$ie.document导航HTML对象模型。使用Get-Member和HTML方法，如GetElementsByTagName()或GetElementById()。
如果凭据是一个问题，将其构建到一个函数中，然后使用Invoke-Command和-Credentials参数来定义您的登录信息。