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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 v2.1.166 5 Jun 2026

WebFetch proxy for first-party users

What

First-party Claude.ai users can route WebFetch requests through an Anthropic-side proxy by setting CLAUDE_CODE_WEBFETCH_PROXY_PATH to a path-only URL (e.g. /v1/proxy/fetch). Requests are forwarded to the configured ANTHROPIC_BASE_URL.

Evidence

New proxy fetch handler (search for "ccr webfetch-proxy transport error:")

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

See this entry in the whole of v2.1.166 →