Powershell 测试网站页面可用性和 HTTP 响应代码状态 try/catch答案

【问题标题】：Powershell to test website page availability & HTTP response code status try/catchPowershell 测试网站页面可用性和 HTTP 响应代码状态 try/catch
【发布时间】：2020-08-10 02:49:38
【问题描述】：

我正在尝试修改下面的代码，以便它可以在主网页下测试网站页面：

Clear-Host
$serverName = 'hotel.com/login', 'bing.com/help', 'yahoo.com/mail', 'bong.com', 'bing.com', 'hotel.com'
$statusCodesAllowed = (200, 302, 401) #Update this array to include the HTTP status codes that you want to mark as OK.$stat = 0

Foreach ($URL in $serverName) {
    Try {
        $web = Invoke-WebRequest -Uri https://$URL -Method Head -UseDefaultCredentials -UseBasicParsing -ErrorAction Stop
        $stat = [int]($statusCodesAllowed -contains $web.statusCode)
        Write-Host "`nURL: $($URL) - $([System.Net.Dns]::GetHostAddresses($URL))" -ForegroundColor Yellow
        Write-Host 'Statistic.Status: '$stat -ForegroundColor Green
        Write-Host 'Message.Status: ' $web.StatusCode $web.StatusDescription -ForegroundColor Green
    }

    Catch {
        $statusCode = ($_.Exception.Message.Substring(($_.Exception.Message.IndexOf('(') + 1), 3))
        $stat = [int]($statusCodesAllowed -contains $statusCode)
        Write-Host "`nURL: $($URL) - $([System.Net.Dns]::GetHostAddresses($URL))" -ForegroundColor Red
        Write-Warning 'Statistic.Status: '$stat
        Write-Warning 'Message.Status: '$_.Exception.Message
    }
}

Finally { Remove-Variable serverName, statusCodesAllowed, stat, web, statusCode -ErrorAction SilentlyContinue }

上面的代码在主页上运行良好，但不适用于进一步的 main.website/pagename 格式。

错误：

Exception calling "GetHostAddresses" with "1" argument(s): "No such host is known"
At line:17 char:40
+ ...  "`nURL: $($URL) - $([System.Net.Dns]::GetHostAddresses($URL))" -Fore ...
+                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : SocketException
 
Exception calling "GetHostAddresses" with "1" argument(s): "No such host is known"
At line:17 char:40
+ ...  "`nURL: $($URL) - $([System.Net.Dns]::GetHostAddresses($URL))" -Fore ...
+                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : SocketException
 
Exception calling "GetHostAddresses" with "1" argument(s): "No such host is known"
At line:17 char:40
+ ...  "`nURL: $($URL) - $([System.Net.Dns]::GetHostAddresses($URL))" -Fore ...
+                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : SocketException

最后，当网页无法访问或主机无法访问时，如何过滤掉错误信息？所以错误可以更友好，例如：

找不到网址
无法访问主机。

【问题讨论】：

您可能需要使用 URI 的主机+域部分。 ($url -split '/')[0] 应该可以工作
@AdminOfThings，感谢您对代码的建议，但是，当我将其修改为： $web = Invoke-WebRequest -Uri https://($url -split '/')[ 0] -Method Head -UseDefaultCredentials -UseBasicParsing -ErrorAction Stop 它不适用于所有服务器地址和 URL 输入？
仅对 dns 解析部分执行此操作。

标签： powershell

【解决方案1】：

[System.Net.Dns]::GetHostAddresses 方法需要一个主机名或 IP 地址作为参数。在参数中包含 URL 将引发错误。与您的数据集产生一致结果的一种简单方法是从 URL 中拆分主机名和域：

Write-Host "`nURL: $(($URL -split '/')[0]) - $([System.Net.Dns]::GetHostAddresses(($URL -split '/')[0]))"

【讨论】：

仍然出现如下错误：检查hotel.com/login 页面时。 URL：hotel.com - 204.74.99.101 写警告：找不到接受参数“0”的位置参数。在 line:18 char:9 + Write-Warning 'Statistic.Status: '$stat + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~ + CategoryInfo : InvalidArgument: (:) [Write-Warning], ParameterBindingException + FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.PowerShell.Commands.WriteWarningCommand。