Powershell script for setting IIS header

setHeader.ps1

$PSPath =  'MACHINE/WEBROOT/APPHOST/' + $WebsiteName
$Filter = 'system.webServer/httpProtocol/customHeaders'

# Ensure working with IIS 7 and 7.5(+?)
try {
    Add-PSSnapin WebAdministration
} 
catch {
    try {
        Import-Module WebAdministration
    } 
    catch {
        Write-Warning "We failed to load the WebAdministration module. This usually resolved by doing one of the following:"
        Write-Warning "1. Install .NET Framework 3.5.1"
        Write-Warning "2. Upgrade to PowerShell 3.0 (or greater)"
        throw ($error | Select-Object -First 1)
    }
} 

# First check if the header exists
$customHeadersCollection = Get-WebConfiguration -Filter $Filter -PSPath $PSPath
$exists = $false
foreach($path in $customHeadersCollection.GetCollection()){
    if ($path.GetAttributeValue("name") -eq $HeaderName){
        Write-Host "Header $HeaderName already exists"
        $exists = $true
        break
    }
}

# Delete the header if it exists..
if ($exists){
    Write-Host "Removing header $HeaderName"
    Remove-WebConfigurationProperty -PSPath $PSPath -Name . -Filter $Filter -AtElement @{name =$HeaderName }
}

# Add the new header
Write-Host "Adding header $HeaderName with value $HeaderValue"
Add-WebConfigurationProperty -pspath $PSPath -filter $Filter -name . -AtElement @{name=$HeaderName; value=$HeaderValue}

Donaldgray, thank you very much for the code idea, it helped!