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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
This commit is contained in:
Aritra Basu 2026-04-27 19:35:38 -04:00 • committed by Daniel Stenberg
parent efc3f2309e
commit e78b1b3ecc
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66 changed files with 7401 additions and 473 deletions
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17
lib/http.c
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@ -1757,6 +1757,12 @@ CURLcode Curl_add_custom_headers(struct Curl_easy *data,
else
h[0] = data->set.headers;
break;
case HEADER_CONNECT_UDP:
if(data->set.sep_headers)
h[0] = data->set.proxyheaders;
else
h[0] = data->set.headers;
break;
}
#else
(void)is_connect;
@ -2721,7 +2727,11 @@ static CURLcode http_check_new_conn(struct Curl_easy *data)
alpn = Curl_conn_get_alpn_negotiated(data, conn);
if(alpn && !strcmp("h3", alpn)) {
DEBUGASSERT(Curl_conn_http_version(data, conn) == 30);
#ifndef CURL_DISABLE_PROXY
if((Curl_conn_http_version(data, conn) == 30) || !conn->bits.proxy ||
conn->bits.tunnel_proxy)
#endif
DEBUGASSERT(Curl_conn_http_version(data, conn) == 30);
info_version = "HTTP/3";
}
else if(alpn && !strcmp("h2", alpn)) {
@ -4847,7 +4857,6 @@ struct name_const {
size_t namelen;
};
/* keep them sorted by length! */
static const struct name_const H2_NON_FIELD[] = {
{ STRCONST("Host") },
{ STRCONST("Upgrade") },
@ -4861,10 +4870,8 @@ static bool h2_permissible_field(struct dynhds_entry *e)
{
size_t i;
for(i = 0; i < CURL_ARRAYSIZE(H2_NON_FIELD); ++i) {
if(e->namelen < H2_NON_FIELD[i].namelen)
return TRUE;
if(e->namelen == H2_NON_FIELD[i].namelen &&
curl_strequal(H2_NON_FIELD[i].name, e->name))
curl_strnequal(H2_NON_FIELD[i].name, e->name, e->namelen))
return FALSE;
}
return TRUE;