HTTP/3 proxy CONNECT and MASQUE CONNECT-UDP support (ngtcp2 QUIC) by aritrbas · Pull Request #21153 · curl/curl

aritrbas · 2026-03-30T01:06:01Z

This PR adds two major proxy capabilities to curl, targeting the ngtcp2 QUIC backend:

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 (as per RFC 9297 and RFC 9298).

Public API additions:

CURLPROXY_HTTPS3: new proxy type constant for HTTP/3 proxy
--proxy-http3: new CLI flag to negotiate HTTP/3 with an 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):

HTTP/1.1 on HTTP/3 proxy:
  conn -> HTTP/1.1 -> SSL -> HTTP-PROXY -> H3-PROXY -> HAPPY-EYEBALLS -> UDP

HTTP/2 on HTTP/3 proxy:
  conn -> HTTP/2 -> SSL -> HTTP-PROXY -> H3-PROXY -> HAPPY-EYEBALLS -> UDP

MASQUE CONNECT-UDP (tunneling QUIC over any proxy):

HTTP/3 on HTTP/3 proxy:
  conn -> HTTP/3 -> CAPSULE -> HTTP-PROXY -> H3-PROXY -> HAPPY-EYEBALLS -> UDP

HTTP/3 on HTTP/2 proxy:
  conn -> HTTP/3 -> CAPSULE -> HTTP-PROXY -> H2-PROXY -> SSL -> HAPPY-EYEBALLS -> TCP

HTTP/3 on HTTP/1.1 proxy:
  conn -> HTTP/3 -> CAPSULE -> HTTP-PROXY -> H1-PROXY -> SSL -> HAPPY-EYEBALLS -> TCP

Usage:

# HTTP/1.1 through HTTP/3 proxy (CONNECT over QUIC)
curl -k -4 --http1.1 --proxy-insecure --proxytunnel --proxy-http3 --proxy https://<proxy> https://<target>

# HTTP/2 through HTTP/3 proxy (CONNECT over QUIC)
curl -k -4 --http2 --proxy-insecure --proxytunnel --proxy-http3 --proxy https://<proxy> https://<target>

# HTTP/3 through HTTP/3 proxy (MASQUE CONNECT-UDP over QUIC)
curl -k -4 --http3-only --proxy-insecure --proxytunnel --proxy-http3 --proxy https://<proxy> https://<target>

# HTTP/3 through HTTP/2 proxy (MASQUE CONNECT-UDP over TCP)
curl -k -4 --http3-only --proxy-insecure --proxytunnel --proxy-http2 --proxy https://<proxy> https://<target>

# HTTP/3 through HTTP/1.1 proxy (MASQUE CONNECT-UDP over TCP)
curl -k -4 --http3-only --proxy-insecure --proxytunnel --proxy https://<proxy> https://<target>

HTTP/3 Proxy CONNECT (--proxy-http3) and MASQUE CONNECT-UDP (--proxyudptunnel) 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 (i) H2oServer (QUIC-enabled file server) and (ii) H2oProxy (MASQUE proxy with HTTP/1.1 + HTTP/2 + HTTP/3 listeners, proxy.connect and proxy.connect-udp enabled) for testing.

References:

bagder · 2026-03-30T05:54:16Z

I'm not sure why, but it seems git conflicts prevented the CI jobs from running (?)

bagder

Because this is a huge change with lots of new pieces, I think we should declare that this functionality is experimental at first and make them opt-in at build time. This way we can let it in with less risk and we can let the functionality get tested and tweaked for a while first before we say it is production ready.

Some small gentle comments to start out with.

bagder

1177:

curl_version_info.3: missing feature name PROXY-HTTP3

1275:

false positive: fix in #21191

1276:

run make optiontable in lib/ to get it updated as it likes

There are also some build errors in different build configurations, and C89 nits.

Copilot

Pull request overview

This PR introduces experimental proxy support for HTTP/3 (QUIC) and MASQUE CONNECT-UDP when using the ngtcp2/nghttp3 HTTP/3 backend. It extends both libcurl and the curl CLI, adds a capsule-protocol implementation, and introduces new test infrastructure (h2o-based) plus unit/integration tests.

Changes:

Add experimental proxy features: HTTP/3 proxy CONNECT (--proxy-http3, CURLPROXY_HTTPS3) and MASQUE CONNECT-UDP (--proxyudptunnel, CURLOPT_HTTPPROXYUDPTUNNEL).
Implement capsule protocol helpers and extend proxy connection filters (H1/H2 + new H3 proxy filter), including QUIC filter-chain adjustments for UDP tunneling.
Add unit and pytest integration coverage, including an h2o-based test proxy/server harness.

Reviewed changes

Copilot reviewed 69 out of 70 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
`lib/cf-h1-proxy.c`	Adds CONNECT-UDP handling and capsule decapsulation in H1 proxy filter.
`lib/cf-h2-proxy.c`	Adds CONNECT-UDP request/response handling and capsule encapsulation/decapsulation in H2 proxy filter.
`lib/cf-h3-proxy.[ch]`	Introduces the new HTTP/3 proxy filter used when ALPN negotiates h3.
`lib/capsule.[ch]`	Implements capsule encoding/decoding helpers for HTTP Datagrams / CONNECT-UDP.
`lib/vquic/vquic.[ch]`, `lib/vquic/curl_ngtcp2.[ch]`	Adjust QUIC send/recv paths to work over non-UDP lower filters (CONNECT-UDP tunnels).
`lib/connect.c`, `lib/url.c`, `lib/setopt.c`, `lib/version.c`, `include/curl/curl.h`	Wire up new proxy type/option, connection transport selection, and feature exposure.
`src/tool_getparam.[ch]`, `src/tool_cfgable.h`, `src/tool_listhelp.c`, `src/config2setopts.c`	Add CLI flags/options and map them to libcurl options.
`tests/unit/unit3220.c`, `tests/data/test3220`, `tests/unit/Makefile.inc`, `tests/data/Makefile.am`	Add capsule protocol unit tests and integrate them into the unit test suite.
`tests/http/testenv/h2o.py`, `tests/http/testenv/env.py`, `tests/http/testenv/curl.py`, `tests/http/conftest.py`	Add h2o server/proxy harness, env detection, and proxy arg support for HTTP/3.
`tests/http/test_60_h3_proxy.py`, `tests/http/Makefile.am`	Add pytest integration suite for HTTP/3 proxy + CONNECT-UDP.
`configure.ac`, `CMakeLists.txt`, `lib/curl_config-cmake.h.in`, `docs/INSTALL-CMAKE.md`, `docs/EXPERIMENTAL.md`, `docs/tests/HTTP.md`	Add build-time opt-in for experimental HTTP/3 proxy support and document it.
`docs/cmdline-opts/`, `docs/libcurl/opts/`, `docs/libcurl/symbols-in-versions`, `docs/options-in-versions`	Document new CLI options and libcurl symbols/behavior.

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bagder · 2026-04-12T08:30:12Z

There's still a merge conflict and some builds now fail a lot of tests.

- H3 proxy: re-sync code with original source `curl_ngtcp2.c` to reduce differences, and to apply missed minor fixes. Also apply clang-format. Drop redundant `#undef`s, casts, `#endif` comments, includes, drop intermediate variables, sync include and macro order. Follow-up to e78b1b3 #21153 - INSTALL-CMAKE.md: move `CURL_ENABLE_SMB` to the enable section. - tests/http/env: rename `tcpdmp` to `tcpdump` to match object variable. - mbedtls: drop incorrect `mbedTLS 4+` comments. (features are also supported by 3+, meaning it's always supported.) - lib1648: rename a variable to match purpose. - CIPHERS.md: alpha-sort link list. - replace rare `X''` hex markup with `0x`. - `IP v4/6` -> `IPv4/6`. - 'version X.Y' -> 'vX.Y', where sensible. - 'VX.Y' -> 'vX.Y', where sensible. - fix indents, casing, newlines, typos. Closes #21772

Follow-up to e78b1b3 #21153 Closes #21769

To lib, vtls/vauth, vtls/vquic, lib/vtls. Also: - unit3400: drop redundant `(void)arg`. Follow-up to e78b1b3 #21153 - fix comment typos. Closes #21786

vszakats · 2026-05-27T23:21:26Z

To test this, I tried enabling H3 proxy in CI. It builds fine, but pyests
fails with various issues. With h2o missing, it tries to write H3 proxy
test input files into a non-existing docs directory (I'd expect this
to not happen without h2o). With h2o present on macOS, it errors
when starting h2o (I guess).

#21789 (comment)
#21789 (comment)

h2o doesn't seem to be packaged by Debian/Ubuntu. On macOS it's
available on Homebrew (and Linuxbrew), but will be removed in early 2027.

I wonder if there would be ways to fix the above issues, and/or perhaps
use Apache httpd or Caddy for H3 proxy tests to avoid the h2o dependency?

aritrbas · 2026-05-28T06:26:08Z

I wonder if there would be ways to fix the above issues, and/or perhaps
use Apache httpd or Caddy for H3 proxy tests to avoid the h2o dependency?

Thanks for catching this! I have pushed fixes for these issues in #21791

FileNotFoundError when docs/ is missing:
- RCA: test fixtures were writing files before the h2o doc root existed
- Fix: Env.make_data_file() now ensures the target directory exists via os.makedirs(..., exist_ok=True)
Class fixtures creating large files when h2o is absent:
- RCA: _class_scope fixtures run before test-level skip markers
- Fix: added env.have_h2o() guards in _class_scope fixtures
h2o present but fails to start caused fixture errors:
- RCA: session fixtures used assert h2o.initial_start(), which hard-failed the run
- Fix: changed to pytest.skip(...) with h2o logs when startup fails
Path consistency concern (doc_dir usage):
- RCA: test_60_h3_proxy.py hardcoded os.path.join(env.gen_dir, "docs").
- Fix: added H2oServer.docs_dir and updated test_60_h3_proxy.py to use h2o_server.docs_dir
  This matches the same “server owns its doc root” pattern used elsewhere (e.g. httpd.docs_dir)

Regarding h2o alternatives:

Based on my CONNECT-UDP/MASQUE research:

h2o: ✅ Full RFC 9298 support (proxy.connect-udp)
envoy: ✅ Full RFC 9298 support
Apache httpd: ❌ No native CONNECT-UDP support
Caddy: ❌ No documented CONNECT-UDP support
nghttpx: ❌ No CONNECT-UDP support (used in test_60_h3_proxy.py for failure tests)

I used h2o for these tests since it has full CONNECT-UDP support.
A follow-up could be to add Envoy-based CI tests as an alternative since it’s widely packaged (Ubuntu, Homebrew) and supports both CONNECT-UDP and HTTP Datagrams.

DemiMarie · 2026-05-28T07:56:04Z

Envoy isn’t going to help because it requires Bazel and uses a specific binary build of clang.

Fix pytest failures in HTTP/3 proxy tests when h2o is not installed, misconfigured, or fails to start at runtime. This prevents: - FileNotFoundError when h2o document root does not exist - Fixture setup errors when h2o is configured but cannot start - Unused test data file creation when h2o is absent or broken - CI aborts on systems where h2o exists but is not runnable Bug: #21789 (comment) Bug: #21789 (comment) Follow-up to e78b1b3 #21153 Closes #21791

For consistency and to follow existing 'HTTPS-proxy' (with lowercase 'proxy') feature tag more closely. Follow-up to e78b1b3 #21153 Closes #21796

vszakats · 2026-05-28T11:41:43Z

@aritrbas: One issue still lingers: with h2o not installed, h2o tests still want to run, and fail:

=================================== FAILURES ===================================
_ TestH3ProxyFailure.test_60_02_connect_tunnel_fail[fail_h3_over_h3_proxytunnel] _

https://github.com/curl/curl/actions/runs/26571899572/job/78280911172?pr=21789
seen on macOS in CI.

edit: perhaps addressed by @icing's #21798?

icing · 2026-05-28T12:21:54Z

@vszakats If you like, merge #21798 . It should fix the problem you describe.

Also: - GHA/http3-linux: enable deprecated APIs in openssl-prev local OpenSSL builds. Required by h2o and its vendored dependencies. Tried OpenSSL 4, LibreSSL 4.x, BoringSSL: all failed at one point. - GHA/http3-linux: build h2o from source. libuv1-dev may not be stricly required. Tried installing libwslay-dev, but it wasn't recognized. Also disable building h2o libs for a much smaller dist directory and slightly faster build. Sadly, h2o is not versioned, so I pinned to the current latest commit at the master branch. It advertises itself as 2.3.0-DEV in pytest. - drop redundant `libnghttp3` installs. Remains of openssl-quic builds. Follow-up to 6aaac9d #20226 Note GHA/macos pytests may or not not be stable with the H3 proxy tests. Follow-up to e78b1b3 #21153 Closes #21789

code: - less exception handling in existing code - true ip happy eyeballing - enable certificate verification - cf-h2-proxy: abort connection when server closed connection tests: - remove all --insecure and --proxy-insecure args - make session reuse test_60_12 a working one - resolve port conflicts between h2o and nghttpx - use proxy args better - make test_60_06 run shorter - kill h2o at the end of tests, normal stop takes too long Ref: 59213f8 #21789 Follow-up to e78b1b3 #21153 Closes #21798

Also fix `nwritten` signedness in `cb_h3_read_req_body()`. Follow-up to e78b1b3 #21153 Ref: #20848 Closes #21799

- replace literal -1 with `NGHTTP3_ERR_CALLBACK_FAILURE` in nghttp3 callback. - replace `NGHTTP3_ERR_CALLBACK_FAILURE` with `NGTCP2_ERR_CALLBACK_FAILURE` in ngtcp2 callbacks. - test_60_h3_proxy: fix non-critical typo in symbol. Spotted by GitHub Code Quality Follow-up to e78b1b3 #21153 Closes #21802

- test_60_02_connect_tunnel_fail[fail_h3_over_h2_proxytunnel] - test_60_03_h3_target_auto_connect_udp[proxy_h3] - test_60_15_connect_timeout Follow-up to 59213f8 curl#21789 Follow-up to e78b1b3 curl#21153

- test_60_02_connect_tunnel_fail[fail_h1_over_h3_proxytunnel] - test_60_02_connect_tunnel_fail[fail_h3_over_h2_proxytunnel] - test_60_02_connect_tunnel_fail[fail_h3_over_h3_proxytunnel] - test_60_03_h3_target_auto_connect_udp[proxy_h3] - test_60_15_connect_timeout Further flaky ones may be disabled in future commits. All to be re-enabled after stabilizing them. Follow-up to 59213f8 #21789 Follow-up to e78b1b3 #21153 Closes #21803

- merge tests into a single class. For shorter names, to fix sort order by test number, and to align with other tests. - fix preconditions to make `test_60_04_guard_proxy_http3_unsupported` actually run. - replace local precondition with constant of the same effect. - drop redundant non-`ngtcp2` requirement for `test_60_04_guard_proxy_http3_unsupported`. (seemed relevant for no longer supported openssl-quic builds.) - drop unused `NGTCP2_ONLY_MSG` constant. Follow-up to e4139a7 #21798 - avoid creating unnecessary test data blobs, and minimize their scopes. Follow-up to 91facd7 #21791 Follow-up to e78b1b3 #21153 Closes #21811

Some platforms require inclusion of arpa/inet.h in order to use ntohs(). Follow-up to e78b1b3 #21153 Closes #21834

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 curl#21153

- H3 proxy: re-sync code with original source `curl_ngtcp2.c` to reduce differences, and to apply missed minor fixes. Also apply clang-format. Drop redundant `#undef`s, casts, `#endif` comments, includes, drop intermediate variables, sync include and macro order. Follow-up to e78b1b3 curl#21153 - INSTALL-CMAKE.md: move `CURL_ENABLE_SMB` to the enable section. - tests/http/env: rename `tcpdmp` to `tcpdump` to match object variable. - mbedtls: drop incorrect `mbedTLS 4+` comments. (features are also supported by 3+, meaning it's always supported.) - lib1648: rename a variable to match purpose. - CIPHERS.md: alpha-sort link list. - replace rare `X''` hex markup with `0x`. - `IP v4/6` -> `IPv4/6`. - 'version X.Y' -> 'vX.Y', where sensible. - 'VX.Y' -> 'vX.Y', where sensible. - fix indents, casing, newlines, typos. Closes curl#21772

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This was referenced May 27, 2026

INSTALL-CMAKE.md: document H2O config variable #21769

Closed

tidy-up: miscellaneous #21772

Closed

vszakats added a commit that referenced this pull request May 27, 2026

INSTALL-CMAKE.md: document H2O config variable

4f31f07

Follow-up to e78b1b3 #21153 Closes #21769

vszakats mentioned this pull request May 27, 2026

tidy-up: apply clang-format fixes #21786

Closed

vszakats added a commit that referenced this pull request May 27, 2026

tidy-up: apply clang-format fixes

5932008

To lib, vtls/vauth, vtls/vquic, lib/vtls. Also: - unit3400: drop redundant `(void)arg`. Follow-up to e78b1b3 #21153 - fix comment typos. Closes #21786

vszakats mentioned this pull request May 27, 2026

GHA: enable H3 proxy in CI, also enable h2o tests on Linux #21789

Closed

1 task

vszakats mentioned this pull request May 28, 2026

h3-proxy: rename feature 'Proxy/PROXY-HTTP3' to 'proxy-HTTP3' #21796

Closed

vszakats added a commit that referenced this pull request May 28, 2026

h3-proxy: rename feature 'Proxy/PROXY-HTTP3' to 'proxy-HTTP3'

cfa735c

For consistency and to follow existing 'HTTPS-proxy' (with lowercase 'proxy') feature tag more closely. Follow-up to e78b1b3 #21153 Closes #21796

vszakats mentioned this pull request May 28, 2026

h3: sync printf masks with types, drop two casts #21799

Closed

vszakats added a commit that referenced this pull request May 28, 2026

h3: sync printf masks with types, drop two casts

c2ca16f

Also fix `nwritten` signedness in `cb_h3_read_req_body()`. Follow-up to e78b1b3 #21153 Ref: #20848 Closes #21799

This was referenced May 28, 2026

h3-proxy: disable frequently failing pytests #21803

Closed

h3-proxy: fix callback return values, and a typo in tests #21802

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vszakats mentioned this pull request May 31, 2026

pytest: fixes and tidy-ups to h3-proxy tests #21811

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vszakats pushed a commit that referenced this pull request Jun 1, 2026

capsule: include arpa/inet.h for ntohs() declaration

2a63957

Some platforms require inclusion of arpa/inet.h in order to use ntohs(). Follow-up to e78b1b3 #21153 Closes #21834

aritrbas deleted the adding-masque-support-ngtcp2-only branch June 3, 2026 16:15

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aritrbas commented May 28, 2026

Regarding h2o alternatives:

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