ResponseCode

# ___ ___ _____ ___
#| _ \ _ \_   _/ __|
#|  _/   / | || (_ |
#|_| |_|_\ |_| \___|
#    NETWORK MONITOR
#-------------------
# Description: The script will check if a URL returns the expected return code and alert you if it doesn't
# Parameters:
# - URL: The site you want to check. Format: www.google.de
# - ResponseCode: The expected numerical response code (overview: http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html).
# - Protocol: http or https are supported.
# ------------------
# (c) 2016 Stephan Linke | Paessler AG

param(
    [string]$URL = "www.google.de",
       [int]$ResponseCode = 200,
    [string]$protocol = "http"
)

# Ignore SSL errors
[System.Net.ServicePointManager]::ServerCertificateValidationCallback = {$true}

# ...otherwise use the given URL
$URL = $protocol+"://"+$URL+"/"
$req = [system.Net.WebRequest]::Create($URL)

# catch exceptions
try
{
    # retrieve the response cod
    [int]$Response = ($req.GetResponse()).StatusCode

    if([int]$Response -eq [int]$ResponseCode)
    { Write-Host $Response":Page returned HTTP code "$ResponseCode" as expected (used "$URL")."; }
    else
    { Write-Host $Response":Page returned "$Response" instead of $ResponseCode unexpectedly (used "$URL")."; exit 2; }

}
catch [System.Net.WebException] {
    $res = ($_.Exception.Message -match '\d+');
    $Response = $Matches[0]

    if([int]$Response -eq [int]$ResponseCode)
    { Write-Host $Response":Page returned HTTP code "$ResponseCode" as expected (used "$URL")."; }
    else
    { Write-Host $Response":Page returned "$Response" instead of $ResponseCode unexpectedly (used "$URL")."; exit 2; }
}