win_uri: fixes (#35487)

* win_uri: moved away from Invoke-WebRequest and fixed multiple issues

* fixes from review

test/integration/targets/uri/files/testserver.ps1

@@ -1,36 +0,0 @@
-param (
-    [int]$port = 8000
-)
-
-$listener = New-Object Net.HttpListener
-$listener.Prefixes.Add("http://+:$port/")
-$listener.Start()
-
-try {
-    while ($listener.IsListening) {
-        # process received request
-        $context = $listener.GetContext()
-        $Request = $context.Request
-        $Response = $context.Response
-        #$Response.Headers.Add("Content-Type","text/plain")
-
-        $received = '{0} {1}' -f $Request.httpmethod, $Request.url.localpath
-
-        # is there HTML content for this URL?
-        $html = $htmlcontents[$received]
-        if ($html -eq $null) {
-            $Response.statuscode = 404
-            $html = 'Oops, the page is not available!'
-        }
-
-        # return the HTML to the caller
-        $buffer = [Text.Encoding]::UTF8.GetBytes($html)
-        $Response.ContentLength64 = $buffer.length
-        $Response.OutputStream.Write($buffer, 0, $buffer.length)
-
-        $Response.Close()
-    }
-} finally {
-    $listener.Stop()
-    $listener.Close()
-}