---
type: note
kind: Explainer
tags: ['fetch', 'preflight', 'simple-requests']
status: release
ctime: 2022-04-09
mtime: 2024-03-22
generated: { by: human:cbcruk, at: 2024-03-29T14:11:20Z }
verified: { by: claude/opus-5, at: 2026-08-19T00:00:00Z }
sources:
  - id: developer-mozilla-en-us-docs
    resource: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#simple_requests
    title: "조건"
  - id: developer-mozilla-ko-docs
    resource: https://developer.mozilla.org/ko/docs/Web/HTTP/CORS#%EB%8B%A8%EC%88%9C_%EC%9A%94%EC%B2%ADsimple_requests
    title: "단순 요청(Simple requests)"
  - id: aws-amazon-ko-premiumsupport
    resource: https://aws.amazon.com/ko/premiumsupport/knowledge-center/no-access-control-allow-origin-error/
    title: "CloudFront 배포의 캐시 동작이 HTTP 요청에 대한 OPTIONS 메서드를 허용함"
---

- [조건](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#simple_requests)에 따라서 브라우저에서 자동으로 발생[^53-1]
- OPTIONS 메서드로 요청
- cloudfront에 OPTIONS 메서드 설정이 안되어 있다면 실패[^53-2]

---

[^53-1]: [단순 요청(Simple requests)](https://developer.mozilla.org/ko/docs/Web/HTTP/CORS#%EB%8B%A8%EC%88%9C_%EC%9A%94%EC%B2%ADsimple_requests)
[^53-2]: [CloudFront 배포의 캐시 동작이 HTTP 요청에 대한 OPTIONS 메서드를 허용함](https://aws.amazon.com/ko/premiumsupport/knowledge-center/no-access-control-allow-origin-error/)