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🐛 QUIC Hijack() skips the status-written check that HTTP/2 enforces

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Evaluación

Dificultad
2/5
Tiempo estimado
1-3 horas
Aptitud para principiantes
78/100
Tipo de issue
Error
Claridad
Bien especificado
Estado de actividad
Activo
Stack tecnológico
go
Área
backend, networking

Línea de trabajo

Compare http2RespWriter.Hijack in connection/http2.go with httpResponseAdapter.Hijack in connection/quic_connection.go, focusing on statusWritten and connectResponseSent. Reproduce the differing behavior with the described HTTP/2 and QUIC protocols, then verify that QUIC enforces the same precondition and no longer permits raw writes before a connect response is sent.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

Priority: Normal Type: Bug

Describe the bug

Hijack() has different preconditions on the two transports.

HTTP/2, http2RespWriter.Hijack in connection/http2.go, refuses when no status was written yet:

if !rp.statusWritten {
	return nil, nil, fmt.Errorf("status not yet written before attempting to hijack connection")
}

QUIC, httpResponseAdapter.Hijack in connection/quic_connection.go, has no such check. It always returns a localProxyConnection, even when connectResponseSent is still false, so the caller can write raw bytes to the stream before any connect response went out.

Same caller, different outcome depending on the transport: on HTTP/2 it gets an error, on QUIC it gets a conn.

To Reproduce

Stock cloudflared writes the status before it hijacks, so the built-in ingress path does not hit this. I hit it in a fork that replaces the OriginProxy, with code that hijacks first. net/http/httputil.ReverseProxy does exactly that on a 101: handleUpgradeResponse calls Hijack() and then writes the status line onto the conn itself.

  1. ProxyHTTP serves the request through httputil.ReverseProxy to a backend that answers 101.
  2. With --protocol http2, Hijack fails and the client gets a 502.
  3. With --protocol quic, Hijack succeeds and the caller can write to the stream before any connect response was sent.

Expected behavior

Both transports enforce the same precondition. The HTTP/2 check looks like the right one, so QUIC could refuse the same way while connectResponseSent is false.

Environment and versions

  • OS: Linux
  • Architecture: AMD64
  • Version: 2026.9.1, and the Hijack bodies are unchanged on master as of 2026.9.3

Logs and errors

HTTP/2: status not yet written before attempting to hijack connection. QUIC: no error.

Additional context

I worked around it on my side, so it does not block me. Filing it because the two transports disagree on the ResponseWriter contract, and that is easy to miss.

Lenguaje dominante
Go
Estrellas
15.8k
Forks
1.4k
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Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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