using-webctl
Using webctl in Claude.ai Containers
Browser automation using webctl CLI with automatic proxy authentication handling for Claude.ai's egress-controlled environment.
When This Skill Applies
- User requests browser automation, web scraping, or page interaction
- webctl commands fail with
ERR_TUNNEL_CONNECTION_FAILED - Playwright/Chromium needs to work through authenticated HTTP proxy
Core Problem
Claude.ai containers route traffic through an authenticated egress proxy (HTTP_PROXY env var with JWT credentials). Chromium doesn't properly handle proxy authentication for HTTPS CONNECT tunnels, causing all HTTPS navigation to fail even though curl works.
Solution
A local forwarding proxy (port 18080) intercepts Chromium connections and injects Proxy-Authorization headers before forwarding to the real egress proxy.
Setup Procedure
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