romenskiy2012/curl
1
0
Fork 0
mirror of https://github.com/curl/curl.git synced 2026-08-25 05:43:32 +03:00
Code Issues Projects Releases Packages Wiki Activity

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

Browse source 
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
No known key found for this signature in database
GPG key ID: 5CC908FDB71E12C2
66 changed files with 7401 additions and 473 deletions
Download patch file Download diff file Expand all files Collapse all files

4
lib/curl_trc.c
View file

@ -35,6 +35,7 @@
#include "http_proxy.h"
#include "cf-h1-proxy.h"
#include "cf-h2-proxy.h"
#include "cf-h3-proxy.h"
#include "cf-haproxy.h"
#include "cf-https-connect.h"
#include "cf-ip-happy.h"
@ -578,6 +579,9 @@ static struct trc_cft_def trc_cfts[] = {
{ &Curl_cft_h1_proxy, TRC_CT_PROXY },
#ifdef USE_NGHTTP2
{ &Curl_cft_h2_proxy, TRC_CT_PROXY },
#endif
#if defined(USE_PROXY_HTTP3) && defined(USE_NGHTTP3)
{ &Curl_cft_h3_proxy, TRC_CT_PROXY },
#endif
{ &Curl_cft_http_proxy, TRC_CT_PROXY },
#endif /* !CURL_DISABLE_HTTP */