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`/insta/{thread_id}/{nn}_image_{i}.jpg` 형태의 instagram thread 사진을 단첼린
(`https://danchelin.fearx.gg/`) 및 bootcamp(`https://bootcamp.fearx.gg/`)에
서빙. 본 서버는 8094에 바인드되고 cloudflared-fearx-photos 터널이 외부 노출.
2026-05-13 P1 단첼린 사진 최적화:
- 모든 .jpg 옆에 .webp variant (`scripts/convert_to_webp.py`) 사전 생성됨
- 요청이 `*.jpg` + `Accept: image/webp` 헤더 + 동명 `.webp` 존재 + size > 0
이면 .webp를 image/webp MIME으로 응답. URL은 그대로 .jpg 유지
- 응답엔 항상 `Vary: Accept` 헤더 (CDN 캐싱 정합)
- 0-byte/누락 webp는 자동으로 jpg 폴백
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