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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 v2.1.228

Bedrock requests go through middleware, and streams become real SSE

You'll notice
Useful4 Signal3
Bedrock

The Bedrock backend was rebuilt so streaming and errors behave like every other provider.

What

The AWS Bedrock backend was rebuilt. It no longer swaps in a custom stream class; instead it rewrites each outgoing request and translates Bedrock's binary event stream into a standard server-sent-events response, so streaming and errors behave like every other backend.

Details
  • The rewrite moves the model name into the /model/{id}/invoke or /model/{id}/invoke-with-response-stream path, lifts anthropic-beta header values into the request body, and SigV4-signs the result.
  • Responses whose content type includes application/vnd.amazon.eventstream are converted to text/event-stream.
  • Bedrock exception shapes are emitted as event: error frames in the stream rather than thrown as backend-specific errors.
Evidence

application/vnd.amazon.eventstream

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 v2.1.228 →