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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 v2.1.111 16 Apr 2026

Accept-Encoding Header Added to Requests

HTTP requests now include an Accept-Encoding: identity header across transport types, which may improve compatibility with certain proxy configurations.

Evidence

New header (search for "Accept-Encoding") — 8 occurrences in v2.1.110, 14 in v2.1.111

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

See this entry in the whole of v2.1.111 →