https://stackoverflow.com/questions/35588699/response-to-preflight-request-doesnt-pass-access-control-check
https://stackoverflow.com/questions/32304973/http-options-method-not-allowed-for-users-database-in-couchdb
オープンソースの情報をわかりやすく
https://stackoverflow.com/questions/35588699/response-to-preflight-request-doesnt-pass-access-control-check
https://stackoverflow.com/questions/32304973/http-options-method-not-allowed-for-users-database-in-couchdb