ERR_INCOMPLETE_CHUNKED_ENCODING
ERR_INCOMPLETE_CHUNKED_ENCODING — HTTP/1.1 Transfer-Encoding: chunked response not completed (missing final "0\r\n\r\n" chunk). Causes: backend crash mid-stream, nginx proxy_read_timeout triggered, LLM streaming response aborted, user closes tab. Fix: increase timeouts + robust error handling in app.
Below: causes, fixes, FAQ.
Common Causes
- Backend timeout (PHP max_execution_time exceeded)
- nginx proxy_read_timeout defaults 60s — slow LLM responses timeout
- App crashes mid-write (OOM, panic, uncaught exception)
- Load balancer drain timeout
- CDN cache timeout during origin refresh
Step-by-Step Fix
- nginx:
proxy_read_timeout 300s; proxy_send_timeout 300s; - PHP:
set_time_limit(0)for long-running (streaming) - App: try/catch around streaming, flush on error
- LLM streaming: explicit "event: done\ndata: [DONE]" final chunk
- Enterno HTTP checker detects incomplete responses
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Frequently Asked Questions
Streaming vs buffered?
Streaming: chunked encoding, content flushed as generated. Buffered: full response sent in one chunk with Content-Length.
LLM-specific?
OpenAI/Anthropic streaming sends many tiny chunks. Each chunk = HTTP chunk. Connection idle timeouts on proxy kill long streams.
SSE and chunked?
SSE uses chunked encoding. Connection lasts minutes — proxy timeouts critical. Nginx: <code>proxy_buffering off;</code> for streaming endpoints.
Reproduce?
curl -N https://stream-endpoint — verify if it gets full response. If prematurely cut — backend issue.