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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 v2.1.85 26 Mar 2026

Upstream Proxy for Remote Sessions

What

Remote Claude Code sessions can now route traffic through an upstream WebSocket proxy with automatic CA certificate management.

Details

Activated when CCR_UPSTREAM_PROXY_ENABLED and CLAUDE_CODE_REMOTE environment variables are set
Reads session tokens from /run/ccr/session_token
Connects to the proxy via /v1/code/upstreamproxy/ws WebSocket endpoint
Fetches CA certificates from /v1/code/upstreamproxy/ca-cert
Includes Proxy-Authorization header support
Relay listener starts on 127.0.0.1 for local proxying
Comprehensive error handling and logging with [upstreamproxy] prefix

Evidence

Upstream proxy initialization (search for "[upstreamproxy] enabled on 127.0.0.1")

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

See this entry in the whole of v2.1.85 →