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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeReleasesv2.1.238entry #49

Claude Code v2.1.238 ·

Proxy refusals no longer look like Anthropic blocking you

Proxy tunnel refusals now name a CDN, VPN or firewall instead of looking like an Anthropic block.

You'll notice Improvements
JSON All of v2.1.238
You'll noticeTier: how much it should matter to you
4Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
InternalsArea: what it touches
ImprovementsKind: in v2.1.238,
What probably matters to youSection of the release
What

When a corporate proxy or CDN refuses the CONNECT tunnel, the error now says so instead of surfacing as an Anthropic 403. The failure carries code ERR_PROXY_TUNNEL plus the CONNECT status and headers, and the explanation names a CDN or a VPN/firewall refusing the request before it reached Anthropic.

Details
  • A classifier inspects request-id, cf-ray and server headers to label the refusal as coming from the origin, a Cloudflare-like intermediary, or some other intermediary.
  • Header sniffing gained a separate x-proxy-error reader alongside the existing x-deny-reason.
  • Reachable in this build with no flag.
Evidence

ERR_PROXY_TUNNEL

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

See this entry in the whole of v2.1.238 →

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