WebTransport: Add congestionControl hint (W3C spec compliance) [chromium/src : main]

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Himanshu Panwar (Gerrit)

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Apr 23, 2026, 2:17:35 AM (4 days ago) Apr 23
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Adam Rice (Gerrit)

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File-level comment, Patchset 10 (Latest):
Adam Rice . resolved

lgtm

It would be good to have web platform tests added that verify that a WebTransport session can still be established when `congestionControl` is specified in the constructor.

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File net/quic/dedicated_web_transport_http3_client.cc
Line 374, Patchset 10 (Latest): connection.sent_packet_manager().SetSendAlgorithm(quic::kBBR);
Adam Rice . unresolved

This might not be a good choice. I am looking for someone who knows.

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    Adam Rice (Gerrit)

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    Apr 24, 2026, 4:20:38 AM (3 days ago) Apr 24
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    File net/quic/dedicated_web_transport_http3_client.cc
    Line 374, Patchset 10 (Latest): connection.sent_packet_manager().SetSendAlgorithm(quic::kBBR);
    Adam Rice . unresolved

    This might not be a good choice. I am looking for someone who knows.

    Adam Rice

    Okay, I've confirmed that BBRv1 is not a good choice. Switch to kBBRv2 for now. We may have something better in future.

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    Himanshu Panwar (Gerrit)

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    Apr 24, 2026, 6:29:43 AM (3 days ago) Apr 24
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    File net/quic/dedicated_web_transport_http3_client.cc
    Line 374, Patchset 10: connection.sent_packet_manager().SetSendAlgorithm(quic::kBBR);
    Adam Rice . resolved

    This might not be a good choice. I am looking for someone who knows.

    Adam Rice

    Okay, I've confirmed that BBRv1 is not a good choice. Switch to kBBRv2 for now. We may have something better in future.

    Himanshu Panwar

    I will replace this BBR1 with BBRV2 and create a todo for the same so that we can track this and update whenever we have something better available for low latency than bbrv2.

    For the wpt If I'm right, I think constructor.https.sub.any.js already tests session establishment with the congestionControl values in the constructor. I've also added a new congestion-control.https.any.js that verifies the attribute is readable after connection and returns the expected value.

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        Himanshu Panwar (Gerrit)

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        Adam Rice (Gerrit)

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        Code-Review+1

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        Patchset-level comments
        File-level comment, Patchset 13 (Latest):
        Adam Rice . resolved

        PS13 lgtm

        File net/quic/dedicated_web_transport_http3_client.cc
        Line 374, Patchset 10: connection.sent_packet_manager().SetSendAlgorithm(quic::kBBR);
        Adam Rice . resolved

        This might not be a good choice. I am looking for someone who knows.

        Adam Rice

        Okay, I've confirmed that BBRv1 is not a good choice. Switch to kBBRv2 for now. We may have something better in future.

        Himanshu Panwar

        I will replace this BBR1 with BBRV2 and create a todo for the same so that we can track this and update whenever we have something better available for low latency than bbrv2.

        For the wpt If I'm right, I think constructor.https.sub.any.js already tests session establishment with the congestionControl values in the constructor. I've also added a new congestion-control.https.any.js that verifies the attribute is readable after connection and returns the expected value.

        Adam Rice

        Brilliant, thank you!

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        Daniel Cheng (Gerrit)

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        Daniel Cheng . resolved

        LGTM; I did not look at anything other than the mojom files and runtime_enabled_features.json5.

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        Chromium LUCI CQ (Gerrit)

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        Apr 25, 2026, 4:54:33 AM (2 days ago) Apr 25
        to Himanshu Panwar, Blink W3C Test Autoroller, Daniel Cheng, Adam Rice, Hayato Ito, Hiroki Nakagawa, android-bu...@system.gserviceaccount.com, chromium...@chromium.org, Kentaro Hara, Raphael Kubo da Costa, android-web...@chromium.org, kinuko+ser...@chromium.org, ashleynewson+w...@chromium.org, shimazu+se...@chromium.org, servicewor...@chromium.org, horo+...@chromium.org, kenjibah...@chromium.org, blink-re...@chromium.org, blink-revie...@chromium.org, blink-revie...@chromium.org, blink-...@chromium.org, fenced-fra...@chromium.org, jmedle...@chromium.org, kinuko...@chromium.org, net-r...@chromium.org, network-ser...@chromium.org

        Chromium LUCI CQ submitted the change

        Change information

        Commit message:
        WebTransport: Add congestionControl hint (W3C spec compliance)

        Implement the WebTransportCongestionControl enum, constructor option,
        and readonly attribute per the W3C WebTransport spec.

        The spec defines congestionControl as a hint for the preferred
        congestion control algorithm — an enum {"default", "throughput",
        "low-latency"} passed via WebTransportOptions and readable as a readonly
        attribute on WebTransport.

        Plumbing through all layers:
          - Blink: New enum IDL, option, getter, Blink→Mojo conversion
          - Mojo IPC: New enum + parameter on Connect() and CreateWebTransport()
          - Browser: Thread through throttle/security callback chain
          - Network service: Convert Mojo enum → net::CongestionControlHint
          - net/QUIC: AdjustSendAlgorithm() maps "throughput" → BBR v2,
          "low-latency" → BBR v1, "default" → no change (Cubic)

        A global kWebTransportCongestionControl feature flag overrides
        per-connection hints for Chrome-wide experiments.
        Bug: 501268547
        Change-Id: I6d0d7163fdb777058b940d9b9f699ee65c631dfe
        Reviewed-by: Daniel Cheng <dch...@chromium.org>
        Reviewed-by: Adam Rice <ri...@chromium.org>
        Commit-Queue: Himanshu Panwar <himp...@microsoft.com>
        Cr-Commit-Position: refs/heads/main@{#1620659}
        Files:
        • M android_webview/test/data/web_tests/webexposed/global-interface-listing-expected.txt
        • M content/browser/webtransport/web_transport_connector_impl.cc
        • M content/browser/webtransport/web_transport_connector_impl.h
        • M net/quic/dedicated_web_transport_http3_client.cc
        • M net/quic/dedicated_web_transport_http3_client.h
        • M net/quic/web_transport_client.h
        • M services/network/network_context.cc
        • M services/network/network_context.h
        • M services/network/public/mojom/network_context.mojom
        • M services/network/public/mojom/web_transport.mojom
        • M services/network/test/test_network_context.h
        • M services/network/web_transport.cc
        • M services/network/web_transport.h
        • M services/network/web_transport_unittest.cc
        • M third_party/blink/public/mojom/webtransport/web_transport_connector.mojom
        • M third_party/blink/renderer/bindings/generated_in_modules.gni
        • M third_party/blink/renderer/bindings/idl_in_modules.gni
        • M third_party/blink/renderer/modules/webtransport/test_utils.cc
        • M third_party/blink/renderer/modules/webtransport/test_utils.h
        • M third_party/blink/renderer/modules/webtransport/web_transport.cc
        • M third_party/blink/renderer/modules/webtransport/web_transport.h
        • M third_party/blink/renderer/modules/webtransport/web_transport.idl
        • A third_party/blink/renderer/modules/webtransport/web_transport_congestion_control.idl
        • M third_party/blink/renderer/modules/webtransport/web_transport_options.idl
        • M third_party/blink/renderer/modules/webtransport/web_transport_test.cc
        • M third_party/blink/renderer/platform/runtime_enabled_features.json5
        • A third_party/blink/web_tests/external/wpt/webtransport/congestion-control.https.any.js
        • M third_party/blink/web_tests/external/wpt/webtransport/idlharness.https.sub.any-expected.txt
        • M third_party/blink/web_tests/external/wpt/webtransport/idlharness.https.sub.any.serviceworker-expected.txt
        • M third_party/blink/web_tests/external/wpt/webtransport/idlharness.https.sub.any.sharedworker-expected.txt
        • M third_party/blink/web_tests/external/wpt/webtransport/idlharness.https.sub.any.worker-expected.txt
        • M third_party/blink/web_tests/http/tests/serviceworker/webexposed/global-interface-listing-service-worker-expected.txt
        • M third_party/blink/web_tests/webexposed/global-interface-listing-dedicated-worker-expected.txt
        • M third_party/blink/web_tests/webexposed/global-interface-listing-expected.txt
        • M third_party/blink/web_tests/webexposed/global-interface-listing-shared-worker-expected.txt
        Change size: L
        Delta: 35 files changed, 286 insertions(+), 40 deletions(-)
        Branch: refs/heads/main
        Submit Requirements:
        • requirement satisfiedCode-Review: +1 by Daniel Cheng, +1 by Adam Rice
        Open in Gerrit
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        Gerrit-MessageType: merged
        Gerrit-Project: chromium/src
        Gerrit-Branch: main
        Gerrit-Change-Id: I6d0d7163fdb777058b940d9b9f699ee65c631dfe
        Gerrit-Change-Number: 7743543
        Gerrit-PatchSet: 14
        Gerrit-Owner: Himanshu Panwar <himp...@microsoft.com>
        Gerrit-Reviewer: Adam Rice <ri...@chromium.org>
        Gerrit-Reviewer: Chromium LUCI CQ <chromiu...@luci-project-accounts.iam.gserviceaccount.com>
        Gerrit-Reviewer: Daniel Cheng <dch...@chromium.org>
        Gerrit-Reviewer: Hayato Ito <hay...@chromium.org>
        Gerrit-Reviewer: Himanshu Panwar <himp...@microsoft.com>
        Gerrit-CC: Blink W3C Test Autoroller <blink-w3c-te...@chromium.org>
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        satisfied_requirement

        Blink W3C Test Autoroller (Gerrit)

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        Apr 25, 2026, 5:58:02 AM (2 days ago) Apr 25
        to Himanshu Panwar, Chromium LUCI CQ, Daniel Cheng, Adam Rice, Hayato Ito, Hiroki Nakagawa, android-bu...@system.gserviceaccount.com, chromium...@chromium.org, Kentaro Hara, Raphael Kubo da Costa, android-web...@chromium.org, kinuko+ser...@chromium.org, ashleynewson+w...@chromium.org, shimazu+se...@chromium.org, servicewor...@chromium.org, horo+...@chromium.org, kenjibah...@chromium.org, blink-re...@chromium.org, blink-revie...@chromium.org, blink-revie...@chromium.org, blink-...@chromium.org, fenced-fra...@chromium.org, jmedle...@chromium.org, kinuko...@chromium.org, net-r...@chromium.org, network-ser...@chromium.org

        Message from Blink W3C Test Autoroller

        The WPT PR for this CL has been merged upstream! https://github.com/web-platform-tests/wpt/pull/59463

        Open in Gerrit

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        • requirement satisfiedCode-Coverage
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        Gerrit-MessageType: comment
        Gerrit-Project: chromium/src
        Gerrit-Branch: main
        Gerrit-Change-Id: I6d0d7163fdb777058b940d9b9f699ee65c631dfe
        Gerrit-Change-Number: 7743543
        Gerrit-PatchSet: 14
        Gerrit-Owner: Himanshu Panwar <himp...@microsoft.com>
        Gerrit-Reviewer: Adam Rice <ri...@chromium.org>
        Gerrit-Reviewer: Chromium LUCI CQ <chromiu...@luci-project-accounts.iam.gserviceaccount.com>
        Gerrit-Reviewer: Daniel Cheng <dch...@chromium.org>
        Gerrit-Reviewer: Hayato Ito <hay...@chromium.org>
        Gerrit-Reviewer: Himanshu Panwar <himp...@microsoft.com>
        Gerrit-CC: Blink W3C Test Autoroller <blink-w3c-te...@chromium.org>
        Gerrit-CC: Hiroki Nakagawa <nhi...@chromium.org>
        Gerrit-CC: Kentaro Hara <har...@chromium.org>
        Gerrit-CC: Raphael Kubo da Costa <ku...@igalia.com>
        Gerrit-Comment-Date: Sat, 25 Apr 2026 09:57:53 +0000
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