https://github.com/leejanghe/Today-I-Learned/blob/master/ReactStudy/api_키_숨기기.md

https://velog.io/@kimjumpsun_code/Github에-API-Key-숨기기

https://wpioneer.tistory.com/197

https://medium.com/black-tech-diva/hide-your-api-keys-7635e181a06c

https://nareunhagae.tistory.com/44