ServicePointPortReuse.ps1

param (
    $RequestUrl = "http://127.0.0.1"
)
 
function Main
{
    $ErrorActionPreference = "Stop"
    Add-Type -AssemblyName System.Net.Http
 
    #Get ServicedPoint
    $servicePoint = [Net.ServicePointManager]::FindServicePoint($RequestUrl)
    $servicePoint.ConnectionLimit = 24

    #Create HttpClient and reuse connection if available
    $client = New-Object Net.Http.HttpClient
    #$client.DefaultRequestHeaders.ConnectionClose = $true

    foreach ($i in 1..10)
    {
        $task = $client.GetAsync($RequestUrl)
        #sleep -Milliseconds 100
        #$task.Wait()
    }

    #Opened port is retained about 100 sec
    foreach ($i in 0..120)
    {
        Write-Host ("Current Connection Count: {0} ,Elapsed {1} seconds" -f $servicePoint.CurrentConnections, $i)
        sleep 1
    }

}
 
Main