[fix] Swagger 요청이 https가 아닌 http로 전송되는 문제

[theminjunchoi]

🔗 연관 이슈

• close [fix] Swagger 요청이 https가 아닌 http로 전송되는 문제 #62

📌 문제

Swagger UI에서 API 실행 시 요청이 https://가 아니라 http://dev-api.gamss.kr/... 로 전송됨(Request URL·curl 모두). HTTPS 엣지(nginx) 뒤인데 문서가 http로 URL을 생성.

🔍 원인

• nginx는 이미 X-Forwarded-Proto $scheme(443이면 https)를 앱에 전달 중.
• 그러나 앱(Spring Boot)에 server.forward-headers-strategy 미설정 → X-Forwarded-Proto를 무시 → springdoc이 요청을 http로 인식해 OpenAPI servers URL을 http://로 생성.
• SwaggerConfig는 server URL을 명시하지 않아 요청 스킴을 그대로 사용.

🔧 변경

• application.yml에 server.forward-headers-strategy: framework 추가.
• Spring ForwardedHeaderFilter가 X-Forwarded-Proto/Host를 반영 → 문서·Try it out URL이 https로 생성.
• 앱 포트는 127.0.0.1:8080에만 바인딩돼 nginx만 접근 가능 → 헤더 신뢰 안전(외부 위조 주입 불가).
• 내부 nginx → app의 proxy_pass http://...(같은 서버 평문 연결)는 변경하지 않음(정상 동작).

✅ 검증 (런타임)

요청	결과
프록시 헤더 없음(로컬 직접)	http://localhost:8080 (정상)
X-Forwarded-Proto: https (nginx처럼)	https://dev-api.gamss.kr ✅

🌐 API · DB 영향

• API 변경: 없음(설정만). DB: 없음.

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Reviewing files that changed from the base of the PR and between 703ce53 and 5b75d25.

📒 Files selected for processing (1)

• src/main/resources/application.yml

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• Create PR with unit tests
• Commit unit tests in branch fix/62-swagger-https

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[github-actions]

Test Results

291 tests  ±0   291 ✅ ±0   1m 16s ⏱️ -5s
 46 suites ±0     0 💤 ±0 
 46 files   ±0     0 ❌ ±0 

Results for commit 5b75d25. ± Comparison against base commit 703ce53.

[github-actions]

Test Coverage

Overall Project	74.46%	🍏

There is no coverage information present for the Files changed

[kite707]

Reverse proxy 환경에서 Forwarded 헤더 처리를 통해 Swagger URL이 HTTPS를 사용하도록 구성된 점 확인했습니다!

고생하셨습니다!