← 문제 라이브러리
Network Intermediate NETWORK-010 · 18 min

A missing WebSocket upgrade header drops real-time connections

Covers a reverse-proxy misconfiguration where plain HTTP works but only WebSocket fails.

무료
시나리오

A scenario that narrows down the root cause, centered on looking at the protocol upgrade header together with the proxy config, in the situation of a missing WebSocket upgrade header dropping real-time connections.

먼저 볼 것
  • Identify the primary failure signal in the Proxy Protocols scenario.
  • Separate visible symptoms from the underlying technical dependency.
  • Describe the safest recovery path and the follow-up prevention work.
점검 체크리스트
  1. Summarize the current impact and the last known change.
  2. Collect direct evidence from logs, runtime state, and configuration before changing anything.
  3. Separate immediate recovery from permanent prevention work.
복구와 재발 방지

Choose the smallest safe recovery action first, then record the prevention work that reduces repeat incidents.

같이 보면 좋은 질문
What is the common mistake in WebSocket proxy incidents?

Teams validate only the initial HTTP path and forget that the upgrade headers and connection semantics must survive every proxy hop.