正規表現
HTTP
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/readyState
https://developer.mozilla.org/en-US/docs/Web/HTTP/status
FETCH
API
https://randomuser.me
https://randomuser.me/api
https://randomuser.me/api/?results=10