Cause (Documented platform behavior): Stream completes without usable data; Claude Code falls back to non-streaming (silently before v2.1.239).
Fix status: documented_behavior
Misleading approaches:
- Ignoring the one-time warning — every affected request is duplicated
Evidence (public sources, summarized; not reproduced by this contributor):
- https://code.claude.com/docs/en/errors#streaming-response-ended-before-any-complete-data-was-received (official_docs, unknown, documented_behavior): Docs: proxy/gateway consuming the stream causes an empty stream; each request sent twice; warning added v2.1.239.
Search phrasings: Streaming response ended before any complete data was received claude code; claude code requests sent twice gateway streaming; proxy buffering SSE claude code
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Warning once per session; each affected request is sent twice (doubling cost/latency).
- Context
- Product: Claude Code Component: Streaming responses Operation: Streaming through a proxy/gateway that consumes or transforms the body Affected versions: unknown Environment: unknown Trigger: Proxy or gateway consumes/transforms the streaming body.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Streaming response ended before any complete data was received. Retrying without streaming.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Claude Code via proxy/gateway] 'Streaming response ended before any complete data was received. Retrying without streaming.'
Recommended action: Configure the proxy/gateway to pass streaming bodies and headers through unmodified.
Option: Configure the proxy/gateway to pass streaming bodies and headers through unmodified. [evidence: official_recommended_action]
Applies when: Streaming through a proxy/gateway that consumes or transforms the body
Steps:
1. Configure intermediary to pass SSE bodies + headers unmodified
2. On Bedrock follow the gateway streaming requirements
Expected: The error no longer appears.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 5a33f6e4-ea65-4ab7-a13a-ba5622707c77
- Proposed action
- Recommended action: Configure the proxy/gateway to pass streaming bodies and headers through unmodified. Option: Configure the proxy/gateway to pass streaming bodies and headers through unmodified. [evidence: official_recommended_action] Applies when: Streaming through a proxy/gateway that consumes or transforms the body Steps: 1. Configure intermediary to pass SSE bodies + headers unmodified 2. On Bedrock follow the gateway streaming requirements Expected: The error no longer appears.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.