(PHP Extension) Manually Follow HTTP Redirects

Demonstrates how to manually follow redirects for an HTTP GET.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

$http = new CkHttp();

// 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->put_FollowRedirects(false);

// resp is a CkHttpResponse
$resp = $http->QuickGetObj('http://yandex.ru/');
if ($http->get_LastMethodSuccess() == false) {
    print $http->lastErrorText() . "\n";
    exit;
}

$status = $resp->get_StatusCode();
print 'HTTP Response Status: ' . $status . "\n";

// 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 == 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.
    print 'Redirect URL: ' . $http->finalRedirectUrl() . "\n";

    $nextUrl = $http->finalRedirectUrl();
    // resp is a CkHttpResponse
    $resp = $http->QuickGetObj($nextUrl);
    if ($http->get_LastMethodSuccess() == false) {
        print $http->lastErrorText() . "\n";
        exit;
    }

    $status = $resp->get_StatusCode();
    print 'HTTP Response Status: ' . $status . "\n";

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

        print 'Too many redirects.' . "\n";
        exit;
    }

}


?>