Although the Redirect add form asks for "path" and prefaces the input with the site base url, it does not throw a validation error if a user inadvertently adds an absolute URL for the "from" field. When this happens, it throws a PHP error in the redirect_extensions view, as the link is rewritten using the substitution pattern {{ redirect_source__path }}, producing the error:
InvalidArgumentException: The internal path component 'https://[Link redacted]' is external. You are not allowed to specify an external URL together with internal:/. in Drupal\Core\Url::fromInternalUri() (line 422 of core/lib/Drupal/Core/Url.php).
Install redirect extensions and create a redirect with an absolute URL as the "from" url. Then load /admin/config/search/redirect
In the link rewrite, check if the URL starts with /https:// or /http://. If so, just use the raw path for the rewrite rather than the redirect_source__path object.
Fixed
3.0
Code
Automatically closed - issue fixed for 2 weeks with no activity.