Could not generate a preview, please check the URL is valid and does not redirect then try again.
It seems like the service is down, so the error message is probably incorrect. That being said, you should follow redirects, this is a no-brainer. You can make HEAD requests to save bandwidth. Also, this one is minor, the enter key should submit the form.
I see:
It seems like the service is down, so the error message is probably incorrect. That being said, you should follow redirects, this is a no-brainer. You can make HEAD requests to save bandwidth. Also, this one is minor, the enter key should submit the form.