Check if a string exists in a response from a GET request

Check-XssStatus

add-type @"
    using System.Net;
    using System.Security.Cryptography.X509Certificates;
    public class TrustAllCertsPolicy : ICertificatePolicy {
        public bool CheckValidationResult(
            ServicePoint srvPoint, X509Certificate certificate,
            WebRequest request, int certificateProblem) {
            return true;
        }
    }
"@
[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy

function Check-XssStatus
{
    [CmdletBinding()]
    Param(
        [Parameter(Mandatory = $true,
        HelpMessage = 'Input file.')]
        [string]$file,
        [Parameter(Mandatory = $true,
        HelpMessage = 'XSS String.')]
        [string]$xss,
        [Parameter(Mandatory = $true,
        HelpMessage = 'XSS String.')]
        [string]$CheckString
    )

        $lines = Get-Content $file

    foreach ($line in $lines)
    {
        $uri = "http://$line/$xss"
        if ($line.Contains("443"))
        {
            $uri = "https://$line/$xss"
        }

        try
        {
            $request = Invoke-WebRequest -Uri $uri
            
        }
        catch
        {
            Write-Host -ForegroundColor Red "$line - Connect"
            Out-File -Append "${file}_connect.txt" -InputObject $line
        }
        
        if ($request.RawContent.Contains($CheckString))
        {
            
        }
     }
}