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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

API client request handling moved to a middleware chain

Under the hood
Useful2 Signal2
API Client

API requests are built through a middleware chain, and middleware errors no longer get retried as network failures.

What

Claude Code's copy of the Anthropic SDK builds requests through a middleware chain instead of overriding request preparation. Errors raised by middleware are no longer retried as if they were network failures.

Details
  • Bedrock SigV4 signing and Vertex path rewriting run as middleware over a complete request; Vertex rewrites the URL path and strips the beta query parameter instead of editing a path field.
  • Bedrock reads the AWS region from the shared AWS config file and derives a default base URL from it.
Evidence

middleware error (not retryable)

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 →