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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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| .. | ||
| testenv | ||
| .gitignore | ||
| CMakeLists.txt | ||
| config.ini.in | ||
| conftest.py | ||
| Makefile.am | ||
| requirements.txt | ||
| scorecard.py | ||
| test_01_basic.py | ||
| test_02_download.py | ||
| test_03_goaway.py | ||
| test_04_stuttered.py | ||
| test_05_errors.py | ||
| test_06_eyeballs.py | ||
| test_07_upload.py | ||
| test_08_caddy.py | ||
| test_09_push.py | ||
| test_10_proxy.py | ||
| test_11_unix.py | ||
| test_12_reuse.py | ||
| test_13_proxy_auth.py | ||
| test_14_auth.py | ||
| test_15_tracing.py | ||
| test_16_info.py | ||
| test_17_ssl_use.py | ||
| test_18_methods.py | ||
| test_19_shutdown.py | ||
| test_20_websockets.py | ||
| test_21_resolve.py | ||
| test_22_httpsrr.py | ||
| test_30_vsftpd.py | ||
| test_31_vsftpds.py | ||
| test_32_ftps_vsftpd.py | ||
| test_40_socks.py | ||
| test_50_scp.py | ||
| test_51_sftp.py | ||
| test_60_h3_proxy.py | ||