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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_PRELOADING_PREFETCH_PREFETCH_FEATURES_H_
#define CONTENT_BROWSER_PRELOADING_PREFETCH_PREFETCH_FEATURES_H_
#include "base/feature_list.h"
#include "base/metrics/field_trial_params.h"
#include "content/common/content_export.h"
namespace content {
class BrowserContext;
} // namespace content
namespace features {
// This feature was used to launch the prefetch migration from embedder layer to
// content/, and this work has finished and the old implemnetation was deleted.
// Now this flag is just for injecting parameters through field trials as an
// umberella feature.
CONTENT_EXPORT BASE_DECLARE_FEATURE(kPrefetchUseContentRefactor);
// If enabled, PrefetchContainer can be used for more than one navigation.
// https://crbug.com/1449360
//
// TODO(crbug.com/397882995): Remove this.
CONTENT_EXPORT BASE_DECLARE_FEATURE(kPrefetchReusable);
// The size limit of body size in bytes that can be reused in
// `kPrefetchReusable`.
CONTENT_EXPORT extern const base::FeatureParam<int>
kPrefetchReusableBodySizeLimit;
// If enabled, navigational prefetch is scoped to the referring document's
// network isolation key instead of the old behavior of the referring document
// itself. See crbug.com/1502326
BASE_DECLARE_FEATURE(kPrefetchNIKScope);
// If enabled, prefetches may include client hints request headers.
CONTENT_EXPORT BASE_DECLARE_FEATURE(kPrefetchClientHints);
// This allows controlling the behavior of client hints with prefetches in case
// an unexpected issue arises with the planned behavior, or one is suspected and
// we want to debug more easily.
// TODO(crbug.com/41497015): Remove this control once a behavior is shipped and
// stabilized.
enum class PrefetchClientHintsCrossSiteBehavior {
// Send no client hints cross-site.
kNone,
// Send only the "low-entropy" hints which are included by default.
kLowEntropy,
// Send all client hints that would normally be sent.
kAll,
};
CONTENT_EXPORT extern const base::FeatureParam<
PrefetchClientHintsCrossSiteBehavior>
kPrefetchClientHintsCrossSiteBehavior;
// If enabled, then prefetch serving will apply mitigations if it may have been
// contaminated by cross-partition state.
CONTENT_EXPORT BASE_DECLARE_FEATURE(kPrefetchStateContaminationMitigation);
// If true, contaminated prefetches will also force a browsing context group
// swap.
CONTENT_EXPORT extern const base::FeatureParam<bool>
kPrefetchStateContaminationSwapsBrowsingContextGroup;
// If explicitly disabled, prefetch proxy is not used.
BASE_DECLARE_FEATURE(kPrefetchProxy);
// If enabled, responses with an operative Cookie-Indices will not be used
// if the relevant cookie values have changed.
CONTENT_EXPORT BASE_DECLARE_FEATURE(kPrefetchCookieIndices);
// Does not enable any new behaviour; is only used to parameterize prefetch
// limit values (see content/browser/preloading/prefetch/prefetch_params.cc).
CONTENT_EXPORT BASE_DECLARE_FEATURE(kPrefetchNewLimits);
// Fix for prefetching a URL controlled by a ServiceWorker without fetch
// handler. Currently this stops prefetching for such cases
// (https://crbug.com/379076354).
// Even when `kPrefetchServiceWorker` is enabled, this is still effective for
// SW-ineligible prefetches.
CONTENT_EXPORT BASE_DECLARE_FEATURE(kPrefetchServiceWorkerNoFetchHandlerFix);
// Enabling this will apply net::RequestPriority::MEDIUM for prefetch
// requests triggered by embedders. See crbug.com/353628437 to track this issue.
CONTENT_EXPORT BASE_DECLARE_FEATURE(kPrefetchNetworkPriorityForEmbedders);
// Enabling this will bupm net::RequestPriority once after the running prefetch
// starts to be served.
CONTENT_EXPORT BASE_DECLARE_FEATURE(
kPrefetchBumpNetworkPriorityAfterBeingServed);
// Allow prefetching ServiceWorker-controlled URLs.
CONTENT_EXPORT BASE_DECLARE_FEATURE(kPrefetchServiceWorker);
bool IsPrefetchServiceWorkerEnabled(content::BrowserContext* browser_context);
// If enabled, prefetch caches are cleared when browsing data removal. Please
// see crbug.com/40262310 for more details.
CONTENT_EXPORT BASE_DECLARE_FEATURE(kPrefetchBrowsingDataRemoval);
// Replace current prefetch queue with a new queue and scheduler, which allows
// prioritization, concurrent prefetches, bursting.
//
// For more details, see
// https://docs.google.com/document/d/1W0Nk3Nq6NaUXkBppOUC5zyNmhVqMjYShm1bydGYd9qc
CONTENT_EXPORT BASE_DECLARE_FEATURE(kPrefetchScheduler);
// Call `PrefetchScheduler::Progress()` synchronously as much as possible.
CONTENT_EXPORT extern const base::FeatureParam<bool>
kPrefetchSchedulerProgressSyncBestEffort;
// Controls params for tests of `PrefetchScheduler`.
CONTENT_EXPORT BASE_DECLARE_FEATURE(kPrefetchSchedulerTesting);
CONTENT_EXPORT extern const base::FeatureParam<size_t>
kPrefetchSchedulerTestingActiveSetSizeLimitForBase;
CONTENT_EXPORT extern const base::FeatureParam<size_t>
kPrefetchSchedulerTestingActiveSetSizeLimitForBurst;
// Provide a partial fix for prefetch queueing problem (crbug.com/400233773),
// without `PrefetchScheduler` feature.
CONTENT_EXPORT BASE_DECLARE_FEATURE(
kPrefetchQueueingPartialFixWithoutScheduler);
} // namespace features
#endif // CONTENT_BROWSER_PRELOADING_PREFETCH_PREFETCH_FEATURES_H_
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