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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.

All of v2.1.124 Home All releases olderv2.1.123 v2.1.126newer
Claude Code v2.1.124

Bedrock auth header normalization

The Bedrock client now always sets Authorization: null in defaultHeaders and re-injects the bearer or service-tier headers explicitly. This stops a leaked Authorization header from a parent fetch leaking into Bedrock requests.

Evidence

Bedrock client builder (search for Authorization: null).

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

See this entry in the whole of v2.1.124 →