← All skills

h2c-websocket-smuggling

75 / 100 · Review before installing

Check before installing. Some of what it can do is expected: a security skill usually runs scanners and checks websites.

By dreadnode/capabilities (GitHub) · security · 22 stars · scanned at commit 3ceeb34

Bypass reverse proxy ACLs via H2C upgrade or WebSocket tunnel. Use when proxy blocks internal paths but forwards Upgrade headers, or when standard CL.TE/TE.CL smuggling fails.

Works with any agent that supports SKILL.md skills.

What this skill can do

Safer alternatives

Low-risk skills in the same category (security) that look related. Check that one does what you need.

• 82 Low riskhunt-http-smugglingelementalsouls/Claude-BugHunter · 5,515 stars
• 82 Low risktesting-websocket-api-securitymukul975/Anthropic-Cybersecurity-Skills · 35,906 stars

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'h2c-websocket-smuggling' ] || [ -L ~/.agents/skills/'h2c-websocket-smuggling' ]; then echo 'A skill folder named h2c-websocket-smuggling already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/dreadnode/capabilities' "$d" && git -C "$d" checkout --quiet '3ceeb34c0c33dc36738cf0d4ec86e38b53d98216' -- 'capabilities/web-security/skills/h2c-websocket-smuggling' && mkdir -p ~/.agents/skills && cp -R "$d"/'capabilities/web-security/skills/h2c-websocket-smuggling' ~/.agents/skills/'h2c-websocket-smuggling' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'h2c-websocket-smuggling' ~/.claude/skills/'h2c-websocket-smuggling' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

Badge for your README

The badge for dreadnode/capabilities shows the score of its lowest-scoring skill.

[![SkillTrust](https://zalavijaysinh.github.io/skilltrust/badges/dreadnode/capabilities.svg)](https://zalavijaysinh.github.io/skilltrust/repos/dreadnode/capabilities/)

Score history