src/models/data/SeoData.php
public function getCanonical ()
	{
		if (empty($this->advanced['canonical']))
			return \Craft::$app->request->absoluteUrl;

		return $this->advanced['canonical'];
	}
public function getCanonical ()
	{
		if (empty($this->advanced['canonical']))
			return \Craft::$app->request->absoluteUrl;

		return $this->advanced['canonical'];
	}
Returns the canonical URL (falling back to the current URL if not set)

@return string