Magento 2 – Redirect to Previous Page After Login Instead of My Account Page

Magento relies on the $_SERVER['HTTP_REFERER'] value for redirect logic without qualm; see Mage_Core_Controller_Varien_Action:

/**
 * Set referer url for redirect in responce
 *
 * @param   string $defaultUrl
 * @return  Mage_Core_Controller_Varien_Action
 */
protected function _redirectReferer($defaultUrl=null)
{

    $refererUrl = $this->_getRefererUrl();
    if (empty($refererUrl)) {
        $refererUrl = empty($defaultUrl) ? Mage::getBaseUrl() : $defaultUrl;
    }

    $this->getResponse()->setRedirect($refererUrl);
    return $this;
}

/**
 * Identify referer url via all accepted methods (HTTP_REFERER, regular or base64-encoded request param)
 *
 * @return string
 */
protected function _getRefererUrl()
{
    $refererUrl = $this->getRequest()->getServer('HTTP_REFERER');
    if ($url = $this->getRequest()->getParam(self::PARAM_NAME_REFERER_URL)) {
        $refererUrl = $url;
    }
    if ($url = $this->getRequest()->getParam(self::PARAM_NAME_BASE64_URL)) {
        $refererUrl = Mage::helper('core')->urlDecode($url);
    }
    if ($url = $this->getRequest()->getParam(self::PARAM_NAME_URL_ENCODED)) {
        $refererUrl = Mage::helper('core')->urlDecode($url);
    }

    if (!$this->_isUrlInternal($refererUrl)) {
        $refererUrl = Mage::app()->getStore()->getBaseUrl();
    }
    return $refererUrl;
}

If you aren't content to rely on the $_SERVER['HTTP_REFERER'], the only thing which you can do is store the most recently-visited URL in session and create a getter for this value which handles the case when someone navigates directly to the site.

Just change:

$url="http://127.0.0.1/website/landing-page";

to

$url=Mage::getUrl('landing-page');

if using then try

$this->_redirect($url)

to EDIT: First of all _redirect is not a block class function,it is a controller function.You need direction then used the code

$url=Mage::getUrl('landing-page');

Mage::app()->getFrontController()->getResponse()->setRedirect($url); 
exit();