SimpleSAML_Utilities::postRedirect PHP Method

    public static function postRedirect($destination, $post)
    {
        \SimpleSAML\Utils\HTTP::submitPOSTData($destination, $post);
    }

 /**
  * Send an authenticationResponse using HTTP-POST.
  *
  * @param string $response  The response which should be sent.
  * @param array $idpmd  The metadata of the IdP which is sending the response.
  * @param array $spmd  The metadata of the SP which is receiving the response.
  * @param string|NULL $relayState  The relaystate for the SP.
  * @param string $shire  The shire which should receive the response.
  */
 public function sendResponse($response, $idpmd, $spmd, $relayState, $shire)
 {
     SimpleSAML_Utilities::validateXMLDocument($response, 'saml11');
     $privatekey = SimpleSAML_Utilities::loadPrivateKey($idpmd, TRUE);
     $publickey = SimpleSAML_Utilities::loadPublicKey($idpmd, TRUE);
     $responsedom = new DOMDocument();
     $responsedom->loadXML(str_replace("\r", "", $response));
     $responseroot = $responsedom->getElementsByTagName('Response')->item(0);
     $firstassertionroot = $responsedom->getElementsByTagName('Assertion')->item(0);
     /* Determine what we should sign - either the Response element or the Assertion. The default
      * is to sign the Assertion, but that can be overridden by the 'signresponse' option in the
      * SP metadata or 'saml20.signresponse' in the global configuration.
      */
     $signResponse = FALSE;
     if (array_key_exists('signresponse', $spmd) && $spmd['signresponse'] !== NULL) {
         $signResponse = $spmd['signresponse'];
         if (!is_bool($signResponse)) {
             throw new Exception('Expected the \'signresponse\' option in the metadata of the' . ' SP \'' . $spmd['entityid'] . '\' to be a boolean value.');
         }
     } else {
         $signResponse = $this->configuration->getBoolean('shib13.signresponse', TRUE);
     }
     /* Check if we have an assertion to sign. Force to sign the response if not. */
     if ($firstassertionroot === NULL) {
         $signResponse = TRUE;
     }
     $signer = new SimpleSAML_XML_Signer(array('privatekey_array' => $privatekey, 'publickey_array' => $publickey, 'id' => $signResponse ? 'ResponseID' : 'AssertionID'));
     if (array_key_exists('certificatechain', $idpmd)) {
         $signer->addCertificate($idpmd['certificatechain']);
     }
     if ($signResponse) {
         /* Sign the response - this must be done after encrypting the assertion. */
         /* We insert the signature before the saml2p:Status element. */
         $statusElements = SimpleSAML_Utilities::getDOMChildren($responseroot, 'Status', '@saml1p');
         assert('count($statusElements) === 1');
         $signer->sign($responseroot, $responseroot, $statusElements[0]);
     } else {
         /* Sign the assertion */
         $signer->sign($firstassertionroot, $firstassertionroot);
     }
     $response = $responsedom->saveXML();
     if ($this->configuration->getBoolean('debug', FALSE)) {
         $p = new SimpleSAML_XHTML_Template($this->configuration, 'post-debug.php');
         $p->data['header'] = 'SAML (Shibboleth 1.3) Response Debug-mode';
         $p->data['RelayStateName'] = 'TARGET';
         $p->data['RelayState'] = $relayState;
         $p->data['destination'] = $shire;
         $p->data['response'] = str_replace("\n", "", base64_encode($response));
         $p->data['responseHTML'] = htmlspecialchars(SimpleSAML_Utilities::formatXMLString($response));
         $p->show();
     } else {
         SimpleSAML_Utilities::postRedirect($shire, array('TARGET' => $relayState, 'SAMLResponse' => base64_encode($response)));
     }
 }