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request-smuggling

HTTP request smuggling and desynchronization testing. Use when front proxies, CDNs, or load balancers disagree with the origin on message framing (Content-Length vs Transfer-Encoding), on HTTP/2→HTTP/1 translation, or when exploring client-side desync via browser fetch pipelines.

skills/request-smuggling/SKILL.md

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# SKILL: HTTP Request Smuggling — Expert Attack Playbook

> **AI LOAD INSTRUCTION**: Expert HTTP desync techniques. Covers CL.TE, TE.CL, TE.TE obfuscation variants, HTTP/2 downgrade and pseudo-header confusion, client-side desync (browser `fetch` pipelines), and tool-assisted fuzzing. Assumes familiarity with raw HTTP/1.1 framing and reverse-proxy topologies. This is not “header injection” — it is **message boundary disagreement** between hops.

Routing note: load this skill when you suspect CDN/reverse-proxy and origin disagree on request-end boundaries, or when abnormal concatenation appears during H2-to-H1 downgrade.

## 0. RELATED ROUTING

- [ghost-bits-cast-attack](../ghost-bits-cast-attack/SKILL.md) when the HTTP client library is **Apache HttpClient <= 4.5.9** (HTTPCLIENT-1974/1978) — injecting `瘍瘊` (U+760D U+760A, low bytes `\r\n`) into a header value causes the underlying char-to-byte writer to emit a literal CRLF, splitting the request at the origin without relying on CL/TE disagreement

## 1. QUICK START

### CL.TE first probe (front-end trusts CL, back-end trusts chunked)