SKILL: 401/403 Bypass Techniques — Expert Attack Playbook AI LOAD INSTRUCTION : Comprehensive 401/403 forbidden bypass techniques. Covers path normalization tricks, HTTP method override, header-based bypasses (X-Original-URL, X-Forwarded-For), protocol version tricks, and combination attacks. Base models typically know 2-3 header bypasses but miss the full matrix of path manipulation variants and verb+path combos. 0. RELATED ROUTING - authbypass-authentication-flaws — broader auth bypass (login flaws, session handling) - waf-bypass-techniques — when bypass is WAF-specific rather than access c…