sse-chunk-boundary-debug

JSON parse errors in SSE streams occur when HTTP chunked transfer encoding splits large base64 data lines mid-payload, delivering incomplete JSON fragments to the browser. This happens even with correct nginx configuration when payloads exceed chunk boundary sizes.

Fix unterminated string errors by implementing a line buffer accumulator pattern that reassembles split SSE lines across chunk boundaries before attempting JSON parsing. This accumulates partial data fragments until complete SSE data lines are formed.

No nginx configuration changes are needed when diagnostics confirm nginx is correctly configured. The fix applies to frontend SSE parsing logic by implementing a line buffer accumulator to handle chunked transfer encoding splits client-side.

A line buffer accumulator pattern reassembles split SSE data lines across HTTP chunk boundaries by accumulating partial text fragments until a complete line terminator is reached, then passing intact lines to JSON parsing. This prevents parse failures from incomplete fragments.

Debug SSE streaming for AI chatbot frontends by first verifying nginx configuration is correct, then implementing a line buffer accumulator to reassemble chunked transfer encoding splits. This targets base64 image payloads that break standard line-based SSE parsing.

Use a line buffer accumulator when receiving large SSE payloads via chunked transfer encoding where data lines split mid-content. It is specifically needed when standard line-based SSE parsing fails on base64-encoded payloads routed through nginx.