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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.

← All of v2.1.111 Home All releases ←olderv2.1.110 v2.1.112newer→
Claude Code v2.1.111

Proxy Authentication Helper

What

Enterprise users behind authenticated proxies can now configure a shell command that provides proxy authentication headers, avoiding manual credential management.

Usage
# Enable the proxy auth helper
export CLAUDE_CODE_ENABLE_PROXY_AUTH_HELPER=1

# Optionally configure the cache TTL (in milliseconds)
export CLAUDE_CODE_PROXY_AUTH_HELPER_TTL_MS=60000

Configure proxyAuthHelper in your project or local settings to specify the shell command that outputs a Proxy-Authorization header value.

Details
  • When enabled, Claude Code runs the configured helper command to obtain proxy auth credentials
  • Credentials are cached with a configurable TTL (via CLAUDE_CODE_PROXY_AUTH_HELPER_TTL_MS)
  • If the helper is configured in project/local settings, workspace trust must be accepted before it runs
  • HTTP 407 (Proxy Authentication Required) responses now trigger automatic re-authentication
  • The Proxy-Authenticate header from 407 responses is passed to the helper as CLAUDE_CODE_PROXY_AUTHENTICATE
  • Helper failures are logged with details and fall back to previously cached credentials
  • The feature is marked "EAP" (Early Access Program) in the settings description
Evidence

Proxy auth helper in f08() at line ~100631 (search for "proxyAuthHelper") — 0 occurrences in v2.1.110, 7 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 →