400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=plays+William+Shakspeare,+corrections+illustr.+various+commentators,+added+notes+S.+Johnson+G.+Steevens,+revised+augmented+I.+Reed,+glossarial+index+william+shakespeare because the request was invalid.

This might be because the link was created a long time ago. Try your search again on Google. That’s all we know.