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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 v2.1.186

Proxy Authentication Support (SOCKS)

The internal agent proxy now supports authentication credentials when forwarding to an upstream SOCKS proxy.

Details
  • Auth token is threaded through all proxy environment variables: HTTP_PROXY, HTTPS_PROXY, ALL_PROXY, GRPC_PROXY, FTP_PROXY, DOCKER_HTTP_PROXY, DOCKER_HTTPS_PROXY, CLOUDSDK_PROXY_*.
  • GIT_SSH_COMMAND on Linux includes proxyauth=srt:${token} in the socat command.
  • GIT_CONFIG_PARAMETERS='http.proxyAuthMethod=basic' is set automatically when a proxy auth token is present.
  • The SOCKS server validates credentials and logs "SOCKS auth rejected" on mismatch.
Evidence

Authentication token threading in sandbox environment setup (search for "SOCKS auth rejected" and "GIT_CONFIG_PARAMETERS='http.proxyAuthMethod=basic'")

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 v2.1.186 →