(PowerShell) Manually Follow HTTP Redirects

Demonstrates how to manually follow redirects for an HTTP GET.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$http = New-Object Chilkat.Http

# The FollowRedirects property controls whether redirects
# are automatically followed.  The default behavior is to
# automatically follow redirects.

# Explicitly set FollowRedirects so that redirects are NOT automatically taken:
$http.FollowRedirects = $false

$resp = $http.QuickGetObj("http://yandex.ru/")
if ($http.LastMethodSuccess -eq $false) {
    $($http.LastErrorText)
    exit
}

$status = $resp.StatusCode
$("HTTP Response Status: " + $status)

# The FinalRedirectUrl property will contain the redirect URL
# If FollowRedirects was equal to $true, then all of the 
# intermediate redirects (if any) would be followed until
# there were no more redirects.  However, because 
# FollowRedirects is not $true, FinalRedirectUrl contains
# the next redirect URL.

$loopCount = 0

while (($status -eq 302)) {

    # IMPORTANT: This example requires Chilkat v9.5.0.49 or greater because
    # the FinalRedirectUrl in prior versions is only set when redirects
    # are automatically followed.   Starting in v9.5.0.49, the FinalRedirectUrl is
    # set to the next redirect URL when a 301/302 response is received, regardless
    # of the value of the FollowRedirects property.
    $("Redirect URL: " + $http.FinalRedirectUrl)

    $nextUrl = $http.FinalRedirectUrl
    $resp = $http.QuickGetObj($nextUrl)
    if ($http.LastMethodSuccess -eq $false) {
        $($http.LastErrorText)
        exit
    }

    $status = $resp.StatusCode
    $("HTTP Response Status: " + $status)

    # For safety, prevent infinite loops by
    # keeping a loopCount and only allows following a max 
    # of 10 redirects:
    $loopCount = $loopCount + 1
    if ($loopCount -gt 10) {

        $("Too many redirects.")
        exit
    }

}