HTTP Status codes via Powershell - powershell

Question

Somehow the below codes works fine for the first few test URLs within C:\testurl.txt then it hung up forever when it is processing the 4th URL from the C:\testurl.txt , no idea why it hangs up?
It is already working fine for up to 3 URLs but stuck up on 4th onward
CLS
$urllist = Get-Content "C:\testurl.txt" # URLs to test one in each line
foreach ($url in $urllist) {
Write-Host $url
$req = [System.Net.WebRequest]::Create($url)
try {
$res = $req.GetResponse()
} catch [System.Net.WebException] {
$res = $_.Exception.Response
}
$res.StatusCode
#Print OK or whatever
[int]$res.StatusCode
#Print 200 or whatever
}
It is working fine for up to 3 URLs but hangs the script on 4th URL without any output or error message. Here is the example of c:\testurl.txt
http://www.google.com
http://www.google.com
http://www.google.com
http://www.google.com
http://www.hotmail.com
http://www.gmail.com
http://www.yahoo.com
http://www.msn.com
Please note each URL will be in a new line, you will see that script will stop at (the 4th one) you may try with your own URLs, etc too

Answer 1

then it hung up forever
No - it's hung until the underlying TCP connections of the previous requests time out.
The .NET CLR will internally pool all WebRequest dispatches so that only a finite number of external requests will be initiated concurrently, and as long as you have a number of un-closed WebResponse objects in memory, your requests will start queuing up.
You can avoid this by closing them (as you should):
foreach ($url in $urllist) {
Write-Host $url
$req = [System.Net.WebRequest]::Create($url)
try {
$res = $req.GetResponse()
}
catch [System.Net.WebException] {
$res = $_.Exception.Response
}
finally {
$res.StatusCode
#Print OK or whatever
[int]$res.StatusCode
#Print 200 or whatever
$res.Dispose()
# close connection, dispose of response stream
}
}