Sites up or down check with powershell

Admin 1
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How can I do this script for more then 1 site? I know there is a for each command but can you assist me how can i add this loop for this script?

    Begin {
    $webRequest = [Net.WebRequest]::Create("http://172.20.1.33:81");
}
Process {
    $validStatus = 200, 401

    try {
        $status = $webRequest.GetResponse().StatusCode.value__
    } catch {
        $status = $_.Exception.InnerException.Response.StatusCode.value__
    }
    
    if ($validStatus -contains $status) {
        Write-Host 'Site is up.'
    } else {
        Write-Host 'Site is down.'
    }
}
powershell foreach
1 Answers

Your code looks like part of a function. You could turn into into an advanced function, and make the url a parameter, that accepts multiple values and even pipeline input.

function Test-Url {
    param(
        [Parameter(Position = 0, Mandatory, ValueFromPipeline)]
        [string[]]$Url,
        [int[]]$ValidStatus = (200, 401)
    )
    process {
        foreach ($item in $Url) {
            $webRequest = [Net.WebRequest]::Create($item)
            try {
                $response = $webRequest.GetResponse()
            }
            catch {
                $response = $_.Exception.InnerException.Response    
            }
            $statusCode = $null
            if ($response) {
                $statusCode = [int]$response.StatusCode
                $response.Close()
            }
            [PSCustomObject]@{
                Url = $item
                Online = $validStatus -contains $statusCode
                StatusCode = $statusCode
            }
        }
    }
}

And use it like this:

if ((Test-Url "http://172.20.1.33:81").Online) {
    Write-Host 'Site is up.'
} else {
    Write-Host 'Site is down.'
}

For multiple sites:

Test-Url "http://172.20.1.33:81", "http://172.20.1.34:81"
# or
"http://172.20.1.33:81", "http://172.20.1.34:81" | Test-Url

Note that the same is possible using PowerShell's Invoke-WebRequest

function Test-Url {
    param(
        [Parameter(Position = 0, Mandatory, ValueFromPipeline)]
        [string[]]$Url,
        [int[]]$ValidStatus = (200, 401)
    )
    process {
        foreach ($item in $Url) {
            $webRequest = [Net.WebRequest]::Create($item)
            try {
                $response = Invoke-WebRequest $item
            }
            catch {
                $response = $_.Exception.Response
            }
            $statusCode = $null
            if ($response) {
                $statusCode = [int]$response.StatusCode
            }
            [PSCustomObject]@{
                Url = $item
                Online = $validStatus -contains $statusCode
                StatusCode = $statusCode
            }
        }
    }
}
user_20609660
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