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HTTP/3: add proxy CONNECT and MASQUE CONNECT-UDP support (ngtcp2 QUIC)

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This patch adds two major proxy capabilities to curl (ngtcp2 QUIC):
- HTTP/3 Proxy CONNECT: Tunnel HTTP/1.1 or HTTP/2 traffic through an
  HTTPS proxy that speaks HTTP/3 (QUIC) using the standard CONNECT
  method over an HTTP/3 connection.
- MASQUE CONNECT-UDP: Tunnel HTTP/3 (QUIC) traffic through an HTTP
  proxy (speaking HTTP/1.1, HTTP/2, or HTTP/3) using the extended
  CONNECT method with the CONNECT-UDP protocol (RFC9297 & RFC9298).

Public API additions:
- `CURLPROXY_HTTPS3`: new proxy type constant for HTTP/3 proxy
- `--proxy-http3`: new CLI flag to negotiate HTTP/3 with HTTPS proxy

The implementation adds two new filters:
- `H3-PROXY` - enables negotiating HTTP/3 (QUIC) to the proxy and
  running CONNECT/CONNECT-UDP through that proxy transport.
- `CAPSULE` - dedicated filter inserted between QUIC transport and
  HTTP-PROXY to handle datagram capsule encapsulation/decapsulation.

Here is how the curl filter chaining looks in different scenarios:
- HTTP/3 Proxy CONNECT (tunneling TCP protocols over QUIC proxy):
  conn -> HTTP/1.1 or HTTP/2  -> SSL -> HTTP-PROXY ->
                                 H3-PROXY -> HAPPY-EYEBALLS -> UDP
- MASQUE CONNECT-UDP (tunneling QUIC over any proxy):
  conn -> HTTP/3 -> CAPSULE -> HTTP-PROXY -> H3-PROXY ->
                               HAPPY-EYEBALLS -> UDP
  conn -> HTTP/3 -> CAPSULE -> HTTP-PROXY -> H1-PROXY or H2-PROXY ->
                               SSL -> HAPPY-EYEBALLS -> TCP

- Both features currently require the ngtcp2 QUIC backend.
- Both features are experimental (disabled by default). Enable with
  `--enable-proxy-http3`(autotools) or `-DUSE_PROXY_HTTP3=ON`(CMake).

Tests:
- tests/unit/unit3400.c: Unit tests for capsule protocol encode/decode
- tests/http/test_60_h3_proxy.py: Comprehensive pytest integration suite
- tests/http/testenv/h2o.py: Managing h2o instances with HTTP/1.1, HTTP/2,
  and HTTP/3 (QUIC) listeners, proxy.connect and proxy.connect-udp enabled.

References:
  RFC 9297 - HTTP Datagrams and the Capsule Protocol
  RFC 9298 - Proxying UDP in HTTP
  RFC 9000 §16 — Variable-Length Integer Encoding

Signed-off-by: Aritra Basu <aritrbas+gh@cisco.com>

Closes #21153
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Aritra Basu 2026-04-27 19:35:38 -04:00 • committed by Daniel Stenberg
parent efc3f2309e
commit e78b1b3ecc
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8
include/curl/curl.h
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@ -802,9 +802,11 @@ typedef CURLcode (*curl_ssl_ctx_callback)(CURL *curl, /* easy handle */
#define CURLPROXY_SOCKS5_HOSTNAME 7L /* Use the SOCKS5 protocol but pass along
the hostname rather than the IP
address. added in 7.18.0 */
#define CURLPROXY_HTTPS3 8L /* HTTPS and attempt HTTP/3
added in 8.21.0 */
typedef enum {
CURLPROXY_LAST = 8 /* never use */
CURLPROXY_LAST = 9 /* never use */
} curl_proxytype; /* this enum was added in 7.10 */
/*
@ -1494,8 +1496,8 @@ typedef enum {
CURLOPT(CURLOPT_SHARE, CURLOPTTYPE_OBJECTPOINT, 100),
/* indicates type of proxy. accepted values are CURLPROXY_HTTP (default),
CURLPROXY_HTTPS, CURLPROXY_SOCKS4, CURLPROXY_SOCKS4A and
CURLPROXY_SOCKS5. */
CURLPROXY_HTTPS, CURLPROXY_HTTPS2, CURLPROXY_HTTPS3, CURLPROXY_SOCKS4,
CURLPROXY_SOCKS4A and CURLPROXY_SOCKS5. */
CURLOPT(CURLOPT_PROXYTYPE, CURLOPTTYPE_VALUES, 101),
/* Set the Accept-Encoding string. Use this to tell a server you would like