perf(websocket): add application-level compression with preset dictionary #80
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…nary Replace libwebsockets permessage-deflate extension with application-level deflate compression using a preset dictionary optimized for JitterTrap JSON messages. Benefits over permessage-deflate: - 20-40% smaller than gzip for typical messages (dictionary provides immediate context for common JSON keys, message types, IP prefixes) - Works regardless of libwebsockets build configuration - Lower compression threshold (128 bytes vs typical 256) Compression results with dictionary: - Stats messages: 29% of original (vs 50% with gzip) - Toptalk 5 flows: 22% of original (vs 31% with gzip) - Toptalk 20 flows: 12% of original (vs 15% with gzip) Implementation: - Server: ws_compress.c uses zlib raw deflate with 662-byte dictionary - Client: pako.js inflateRaw with matching dictionary - Messages >128 bytes compressed and sent as binary WebSocket frames - Smaller messages sent uncompressed as text (backward compatible) Security: - 64KB max decompression size limit (prevents decompression bombs) - Graceful fallback if decompression fails Debug helpers available in browser console: - JT.ws.decode(data) - decode compressed message - JT.ws.dictionary - view dictionary string 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <[email protected]>
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Replace libwebsockets permessage-deflate extension with application-level deflate compression using a preset dictionary optimized for JitterTrap JSON messages.
Benefits over permessage-deflate:
Compression results with dictionary:
Implementation:
Security:
Debug helpers available in browser console:
🤖 Generated with Claude Code