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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.9

HybridTransport for Remote Sessions

Remote sessions now use a hybrid transport that sends messages via HTTP POST with WebSocket fallback, improving reliability.

Details
  • Implements retry logic with exponential backoff (up to 10 attempts)
  • Converts WebSocket URLs to HTTP POST endpoints for events API
  • Client errors (4xx except 429) are not retried
  • Maximum backoff delay of 8 seconds
Evidence

Yv0 class at line 542866 (HybridTransport, contains "HybridTransport: POST URL", "cli_hybrid_transport_initialized")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.9 →