API TEST Powershell

function add-https-support(){
    if ("TrustAllCertsPolicy" -as [type]) {
	    #"TrustAllCertsPolicy is already loaded"
    }else{
        #add https support
        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;
    }
}
"@
        $AllProtocols = [System.Net.SecurityProtocolType]'Ssl3,Tls,Tls11,Tls12'
        [System.Net.ServicePointManager]::SecurityProtocol = $AllProtocols
        [System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy
    }

}




function convert-input-to-headers($inputvar){
    $_headerARR=$inputvar.replace("`n",'').split(';',[System.StringSplitOptions]::RemoveEmptyEntries)
    $_headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"

    foreach ($pair in $_headerARR){
        $temp=$pair.split('=',[System.StringSplitOptions]::RemoveEmptyEntries)
        $key=$temp[0]
        $value=$temp[1]
        $_headers.Add("$key","$value")
    }
    return $_headers
}


function api-test($_url , $_method , $_inputHeader , $_expectStatusCode){
    $headers =(convert-input-to-headers $_inputHeader)
    write-host "[checking] API on $url"

    if ($debug -eq "true"){
        write-host "[checking] Header is :"
        write-host ($headers|Out-String)
    }
    try { 
        $response = Invoke-WebRequest -Uri  "$_url" -ErrorAction Continue -headers $headers -Method $_method
        $responeseStatusCode = $response.StatusCode
        write-host "[result] " $responeseStatusCode  $response.StatusDescription
    } catch {
        if ($_.Exception.Response -ne $null){
            $result = $_.Exception.Response.GetResponseStream()
            $reader = New-Object System.IO.StreamReader($result)
            $reader.BaseStream.Position = 0
            $reader.DiscardBufferedData()
            $responseBody = $reader.ReadToEnd();
            write-host "ResponseBody:"
            $responseBody | ConvertTo-Html
            write-host ""
            write-host "ResponseMessage:"
            write-host $_.Exception.Message
            $responeseStatusCode=$_.Exception.Response.StatusCode.Value__
            if($responeseStatusCode -eq $_expectStatusCode){write-host "[result] " $responeseStatusCode "OK"}
        }else{
            write-host ($_)
            
        }
    
    }
    if($responeseStatusCode -ne $_expectStatusCode){
         write-warning "[result] test api fail with Status: $responeseStatusCode (expect: $_expectStatusCode)"
         exit 1
    }
}



$debug="true"
$url="https://google.com"
$method = "POST"
$inputHeader= @'
Accept-Charset=UTF-8;
Accept=application/json
'@
$expectStatusCode="200"
add-https-support
api-test "$url" "$method" "$inputHeader" "$expectStatusCode"

#the result should be 405 error