クロスオリジン
https://ja.nuxtjs.org/faq/http-proxy/
Access to XMLHttpRequest at 'https://www.showroom-live.com/open_api/authorization/confirm?_=1587055072611' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: It does not have HTTP ok status.