Notification into slack (incoming webhook)

Notify-Slack.ps1

$slack_uri_default = 'https://hooks.slack.com/services/'

# Notification via Slack
function Notify-Slack()
{
   param
   (
     [Parameter(Mandatory=$true)]
     $text,
     
     [Parameter(Mandatory=$false)]
     $channel='#slack-webhook-testing',
     
     [Parameter(Mandatory=$false)]
     $username="AzureOps",

     [Parameter(Mandatory=$false)]
     $slack_url=$slack_uri_default
   )

    $slack_msg = New-Object psobject
    $slack_msg | Add-Member -MemberType NoteProperty -TypeName string -Name text -Value $text
    $slack_msg | Add-Member -MemberType NoteProperty -TypeName string -Name channel -Value $channel
    $slack_msg | Add-Member -MemberType NoteProperty -TypeName string -Name username -Value $username
    $slack_msg = ConvertTo-Json $slack_msg

    Invoke-WebRequest -Method Post -uri $slack_url -Body $slack_msg -ContentType "text/plain; charset=utf-8"
}

[string]$mymsg=@"
Hello world
"@

Notify-Slack -text $mymsg

[string]$mymsg=@"
멀티라인 #1
멀티라인 #2
멀티라인 #3
"@
Notify-Slack -text $mymsg -channel '#slack-webhook-testing' -username hello

StatusCode        : 200
StatusDescription : OK
Content           : ok
RawContent        : HTTP/1.1 200 OK
                    Transfer-Encoding: chunked
                    Connection: keep-alive
                    Vary: Accept-Encoding
                    X-Slack-Backend: h
                    Referrer-Policy: no-referrer
                    Strict-Transport-Security: max-age=31536000; includeSubDom...
Forms             : {}
Headers           : {[Transfer-Encoding, chunked], [Connection, keep-alive], [Vary, Accept-Encoding], [X-Slack-Backend, h]...}
Images            : {}
InputFields       : {}
Links             : {}
ParsedHtml        : mshtml.HTMLDocumentClass
RawContentLength  : 2