Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3176 insertions, 0 deletions

diff --git a/netwerk/protocol/http/HttpChannelChild.cpp b/netwerk/protocol/http/HttpChannelChild.cpp
new file mode 100644
index 0000000000..34e7a2cf0d
--- /dev/null
+++ b/netwerk/protocol/http/HttpChannelChild.cpp
@@ -0,0 +1,3176 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et tw=80 : */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// HttpLog.h should generally be included first
+#include "HttpLog.h"
+
+#include "nsHttp.h"
+#include "nsICacheEntry.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/PerfStats.h"
+#include "mozilla/Unused.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/dom/DocGroup.h"
+#include "mozilla/dom/ServiceWorkerUtils.h"
+#include "mozilla/dom/BrowserChild.h"
+#include "mozilla/extensions/StreamFilterParent.h"
+#include "mozilla/ipc/IPCStreamUtils.h"
+#include "mozilla/net/NeckoChild.h"
+#include "mozilla/net/HttpChannelChild.h"
+#include "mozilla/net/UrlClassifierCommon.h"
+#include "mozilla/net/UrlClassifierFeatureFactory.h"
+
+#include "AltDataOutputStreamChild.h"
+#include "CookieServiceChild.h"
+#include "HttpBackgroundChannelChild.h"
+#include "NetworkMarker.h"
+#include "nsCOMPtr.h"
+#include "nsContentPolicyUtils.h"
+#include "nsDOMNavigationTiming.h"
+#include "nsGlobalWindow.h"
+#include "nsStringStream.h"
+#include "nsHttpChannel.h"
+#include "nsHttpHandler.h"
+#include "nsQueryObject.h"
+#include "nsNetUtil.h"
+#include "nsSerializationHelper.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/dom/PerformanceStorage.h"
+#include "mozilla/ipc/InputStreamUtils.h"
+#include "mozilla/ipc/URIUtils.h"
+#include "mozilla/ipc/BackgroundUtils.h"
+#include "mozilla/net/DNS.h"
+#include "mozilla/net/SocketProcessBridgeChild.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/StaticPrefs_network.h"
+#include "mozilla/StoragePrincipalHelper.h"
+#include "SerializedLoadContext.h"
+#include "nsInputStreamPump.h"
+#include "nsContentSecurityManager.h"
+#include "nsICompressConvStats.h"
+#include "mozilla/dom/Document.h"
+#include "nsIScriptError.h"
+#include "nsISerialEventTarget.h"
+#include "nsRedirectHistoryEntry.h"
+#include "nsSocketTransportService2.h"
+#include "nsStreamUtils.h"
+#include "nsThreadUtils.h"
+#include "nsCORSListenerProxy.h"
+#include "nsIOService.h"
+
+#include <functional>
+
+using namespace mozilla::dom;
+using namespace mozilla::ipc;
+
+namespace mozilla::net {
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild
+//-----------------------------------------------------------------------------
+
+HttpChannelChild::HttpChannelChild()
+    : HttpAsyncAborter<HttpChannelChild>(this),
+      NeckoTargetHolder(nullptr),
+      mCacheEntryAvailable(false),
+      mAltDataCacheEntryAvailable(false),
+      mSendResumeAt(false),
+      mKeptAlive(false),
+      mIPCActorDeleted(false),
+      mSuspendSent(false),
+      mIsFirstPartOfMultiPart(false),
+      mIsLastPartOfMultiPart(false),
+      mSuspendForWaitCompleteRedirectSetup(false),
+      mRecvOnStartRequestSentCalled(false),
+      mSuspendedByWaitingForPermissionCookie(false) {
+  LOG(("Creating HttpChannelChild @%p\n", this));
+
+  mChannelCreationTime = PR_Now();
+  mChannelCreationTimestamp = TimeStamp::Now();
+  mLastStatusReported =
+      mChannelCreationTimestamp;  // in case we enable the profiler after Init()
+  mAsyncOpenTime = TimeStamp::Now();
+  mEventQ = new ChannelEventQueue(static_cast<nsIHttpChannel*>(this));
+
+  // Ensure that the cookie service is initialized before the first
+  // IPC HTTP channel is created.
+  // We require that the parent cookie service actor exists while
+  // processing HTTP responses.
+  RefPtr<CookieServiceChild> cookieService = CookieServiceChild::GetSingleton();
+}
+
+HttpChannelChild::~HttpChannelChild() {
+  LOG(("Destroying HttpChannelChild @%p\n", this));
+
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+  // See HttpChannelChild::Release, HttpChannelChild should be always destroyed
+  // on the main thread.
+  MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
+
+  if (mDoDiagnosticAssertWhenOnStopNotCalledOnDestroy && mAsyncOpenSucceeded &&
+      !mSuccesfullyRedirected && !LoadOnStopRequestCalled()) {
+    bool emptyBgChildQueue, nullBgChild;
+    {
+      MutexAutoLock lock(mBgChildMutex);
+      nullBgChild = !mBgChild;
+      emptyBgChildQueue = !nullBgChild && mBgChild->IsQueueEmpty();
+    }
+
+    uint32_t flags =
+        (mRedirectChannelChild ? 1 << 0 : 0) |
+        (mEventQ->IsEmpty() ? 1 << 1 : 0) | (nullBgChild ? 1 << 2 : 0) |
+        (emptyBgChildQueue ? 1 << 3 : 0) |
+        (LoadOnStartRequestCalled() ? 1 << 4 : 0) |
+        (mBackgroundChildQueueFinalState == BCKCHILD_EMPTY ? 1 << 5 : 0) |
+        (mBackgroundChildQueueFinalState == BCKCHILD_NON_EMPTY ? 1 << 6 : 0) |
+        (mRemoteChannelExistedAtCancel ? 1 << 7 : 0) |
+        (mEverHadBgChildAtAsyncOpen ? 1 << 8 : 0) |
+        (mEverHadBgChildAtConnectParent ? 1 << 9 : 0) |
+        (mCreateBackgroundChannelFailed ? 1 << 10 : 0) |
+        (mBgInitFailCallbackTriggered ? 1 << 11 : 0) |
+        (mCanSendAtCancel ? 1 << 12 : 0) | (!!mSuspendCount ? 1 << 13 : 0) |
+        (!!mCallOnResume ? 1 << 14 : 0);
+    MOZ_CRASH_UNSAFE_PRINTF(
+        "~HttpChannelChild, LoadOnStopRequestCalled()=false, mStatus=0x%08x, "
+        "mActorDestroyReason=%d, 20200717 flags=%u",
+        static_cast<uint32_t>(nsresult(mStatus)),
+        static_cast<int32_t>(mActorDestroyReason ? *mActorDestroyReason : -1),
+        flags);
+  }
+#endif
+
+  mEventQ->NotifyReleasingOwner();
+
+  ReleaseMainThreadOnlyReferences();
+}
+
+void HttpChannelChild::ReleaseMainThreadOnlyReferences() {
+  if (NS_IsMainThread()) {
+    // Already on main thread, let dtor to
+    // take care of releasing references
+    return;
+  }
+
+  NS_ReleaseOnMainThread("HttpChannelChild::mRedirectChannelChild",
+                         mRedirectChannelChild.forget());
+}
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsISupports
+//-----------------------------------------------------------------------------
+
+NS_IMPL_ADDREF(HttpChannelChild)
+
+NS_IMETHODIMP_(MozExternalRefCountType) HttpChannelChild::Release() {
+  if (!NS_IsMainThread()) {
+    nsrefcnt count = mRefCnt;
+    nsresult rv = NS_DispatchToMainThread(NewNonOwningRunnableMethod(
+        "HttpChannelChild::Release", this, &HttpChannelChild::Release));
+
+    // Continue Release procedure if failed to dispatch to main thread.
+    if (!NS_WARN_IF(NS_FAILED(rv))) {
+      return count - 1;
+    }
+  }
+
+  nsrefcnt count = --mRefCnt;
+  MOZ_ASSERT(int32_t(count) >= 0, "dup release");
+
+  // Normally we Send_delete in OnStopRequest, but when we need to retain the
+  // remote channel for security info IPDL itself holds 1 reference, so we
+  // Send_delete when refCnt==1.  But if !CanSend(), then there's nobody to send
+  // to, so we fall through.
+  if (mKeptAlive && count == 1 && CanSend()) {
+    NS_LOG_RELEASE(this, 1, "HttpChannelChild");
+    mKeptAlive = false;
+    // We send a message to the parent, which calls SendDelete, and then the
+    // child calling Send__delete__() to finally drop the refcount to 0.
+    TrySendDeletingChannel();
+    return 1;
+  }
+
+  if (count == 0) {
+    mRefCnt = 1; /* stabilize */
+
+    // We don't have a listener when AsyncOpen has failed or when this channel
+    // has been sucessfully redirected.
+    if (MOZ_LIKELY(LoadOnStartRequestCalled() && LoadOnStopRequestCalled()) ||
+        !mListener) {
+      NS_LOG_RELEASE(this, 0, "HttpChannelChild");
+      delete this;
+      return 0;
+    }
+
+    // This makes sure we fulfill the stream listener contract all the time.
+    if (NS_SUCCEEDED(mStatus)) {
+      mStatus = NS_ERROR_ABORT;
+    }
+
+    // Turn the stabilization refcount into a regular strong reference.
+
+    // 1) We tell refcount logging about the "stabilization" AddRef, which
+    // will become the reference for |channel|. We do this first so that we
+    // don't tell refcount logging that the refcount has dropped to zero, which
+    // it will interpret as destroying the object.
+    NS_LOG_ADDREF(this, 2, "HttpChannelChild", sizeof(*this));
+
+    // 2) We tell refcount logging about the original call to Release().
+    NS_LOG_RELEASE(this, 1, "HttpChannelChild");
+
+    // 3) Finally, we turn the reference into a regular smart pointer.
+    RefPtr<HttpChannelChild> channel = dont_AddRef(this);
+
+    // This runnable will create a strong reference to |this|.
+    NS_DispatchToMainThread(
+        NewRunnableMethod("~HttpChannelChild>DoNotifyListener", channel,
+                          &HttpChannelChild::DoNotifyListener));
+
+    // If NS_DispatchToMainThread failed then we're going to leak the runnable,
+    // and thus the channel, so there's no need to do anything else.
+
+    // We should have already done any special handling for the refcount = 1
+    // case when the refcount first went from 2 to 1. We don't want it to happen
+    // when |channel| is destroyed.
+    MOZ_ASSERT(!mKeptAlive || !CanSend());
+
+    // XXX If std::move(channel) is allowed, then we don't have to have extra
+    // checks for the refcount going from 2 to 1. See bug 1680217.
+
+    // This will release the stabilization refcount, which is necessary to avoid
+    // a leak.
+    channel = nullptr;
+
+    return mRefCnt;
+  }
+
+  NS_LOG_RELEASE(this, count, "HttpChannelChild");
+  return count;
+}
+
+NS_INTERFACE_MAP_BEGIN(HttpChannelChild)
+  NS_INTERFACE_MAP_ENTRY(nsIRequest)
+  NS_INTERFACE_MAP_ENTRY(nsIChannel)
+  NS_INTERFACE_MAP_ENTRY(nsIHttpChannel)
+  NS_INTERFACE_MAP_ENTRY(nsIHttpChannelInternal)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsICacheInfoChannel,
+                                     !mMultiPartID.isSome())
+  NS_INTERFACE_MAP_ENTRY(nsIResumableChannel)
+  NS_INTERFACE_MAP_ENTRY(nsISupportsPriority)
+  NS_INTERFACE_MAP_ENTRY(nsIClassOfService)
+  NS_INTERFACE_MAP_ENTRY(nsIProxiedChannel)
+  NS_INTERFACE_MAP_ENTRY(nsITraceableChannel)
+  NS_INTERFACE_MAP_ENTRY(nsIAsyncVerifyRedirectCallback)
+  NS_INTERFACE_MAP_ENTRY(nsIChildChannel)
+  NS_INTERFACE_MAP_ENTRY(nsIHttpChannelChild)
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIMultiPartChannel, mMultiPartID.isSome())
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIThreadRetargetableRequest,
+                                     !mMultiPartID.isSome())
+  NS_INTERFACE_MAP_ENTRY_CONCRETE(HttpChannelChild)
+NS_INTERFACE_MAP_END_INHERITING(HttpBaseChannel)
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::PHttpChannelChild
+//-----------------------------------------------------------------------------
+
+void HttpChannelChild::OnBackgroundChildReady(
+    HttpBackgroundChannelChild* aBgChild) {
+  LOG(("HttpChannelChild::OnBackgroundChildReady [this=%p, bgChild=%p]\n", this,
+       aBgChild));
+  MOZ_ASSERT(OnSocketThread());
+
+  {
+    MutexAutoLock lock(mBgChildMutex);
+
+    // mBgChild might be removed or replaced while the original background
+    // channel is inited on STS thread.
+    if (mBgChild != aBgChild) {
+      return;
+    }
+
+    MOZ_ASSERT(mBgInitFailCallback);
+    mBgInitFailCallback = nullptr;
+  }
+}
+
+void HttpChannelChild::OnBackgroundChildDestroyed(
+    HttpBackgroundChannelChild* aBgChild) {
+  LOG(("HttpChannelChild::OnBackgroundChildDestroyed [this=%p]\n", this));
+  // This function might be called during shutdown phase, so OnSocketThread()
+  // might return false even on STS thread. Use IsOnCurrentThreadInfallible()
+  // to get correct information.
+  MOZ_ASSERT(gSocketTransportService);
+  MOZ_ASSERT(gSocketTransportService->IsOnCurrentThreadInfallible());
+
+  nsCOMPtr<nsIRunnable> callback;
+  {
+    MutexAutoLock lock(mBgChildMutex);
+
+    // mBgChild might be removed or replaced while the original background
+    // channel is destroyed on STS thread.
+    if (aBgChild != mBgChild) {
+      return;
+    }
+
+    mBgChild = nullptr;
+    callback = std::move(mBgInitFailCallback);
+  }
+
+  if (callback) {
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+    mBgInitFailCallbackTriggered = true;
+#endif
+    nsCOMPtr<nsISerialEventTarget> neckoTarget = GetNeckoTarget();
+    neckoTarget->Dispatch(callback, NS_DISPATCH_NORMAL);
+  }
+}
+
+mozilla::ipc::IPCResult HttpChannelChild::RecvOnStartRequestSent() {
+  LOG(("HttpChannelChild::RecvOnStartRequestSent [this=%p]\n", this));
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!mRecvOnStartRequestSentCalled);
+
+  mRecvOnStartRequestSentCalled = true;
+
+  if (mSuspendedByWaitingForPermissionCookie) {
+    mSuspendedByWaitingForPermissionCookie = false;
+    mEventQ->Resume();
+  }
+  return IPC_OK();
+}
+
+void HttpChannelChild::ProcessOnStartRequest(
+    const nsHttpResponseHead& aResponseHead, const bool& aUseResponseHead,
+    const nsHttpHeaderArray& aRequestHeaders,
+    const HttpChannelOnStartRequestArgs& aArgs,
+    const HttpChannelAltDataStream& aAltData) {
+  LOG(("HttpChannelChild::ProcessOnStartRequest [this=%p]\n", this));
+  MOZ_ASSERT(OnSocketThread());
+
+#ifdef NIGHTLY_BUILD
+  TimeStamp start = TimeStamp::Now();
+#endif
+
+  mAltDataInputStream = DeserializeIPCStream(aAltData.altDataInputStream());
+
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<HttpChannelChild>(this), aResponseHead,
+#ifdef NIGHTLY_BUILD
+             aUseResponseHead, aRequestHeaders, aArgs, start]() {
+        if (self->mLoadFlags & nsIRequest::LOAD_RECORD_START_REQUEST_DELAY) {
+          TimeDuration delay = TimeStamp::Now() - start;
+          Telemetry::Accumulate(
+              Telemetry::HTTP_PRELOAD_IMAGE_STARTREQUEST_DELAY,
+              static_cast<uint32_t>(delay.ToMilliseconds()));
+        }
+#else
+             aUseResponseHead, aRequestHeaders, aArgs]() {
+#endif
+
+        self->OnStartRequest(aResponseHead, aUseResponseHead, aRequestHeaders,
+                             aArgs);
+      }));
+}
+
+static void ResourceTimingStructArgsToTimingsStruct(
+    const ResourceTimingStructArgs& aArgs, TimingStruct& aTimings) {
+  aTimings.domainLookupStart = aArgs.domainLookupStart();
+  aTimings.domainLookupEnd = aArgs.domainLookupEnd();
+  aTimings.connectStart = aArgs.connectStart();
+  aTimings.tcpConnectEnd = aArgs.tcpConnectEnd();
+  aTimings.secureConnectionStart = aArgs.secureConnectionStart();
+  aTimings.connectEnd = aArgs.connectEnd();
+  aTimings.requestStart = aArgs.requestStart();
+  aTimings.responseStart = aArgs.responseStart();
+  aTimings.responseEnd = aArgs.responseEnd();
+}
+
+void HttpChannelChild::OnStartRequest(
+    const nsHttpResponseHead& aResponseHead, const bool& aUseResponseHead,
+    const nsHttpHeaderArray& aRequestHeaders,
+    const HttpChannelOnStartRequestArgs& aArgs) {
+  LOG(("HttpChannelChild::OnStartRequest [this=%p]\n", this));
+
+  // If this channel was aborted by ActorDestroy, then there may be other
+  // OnStartRequest/OnStopRequest/OnDataAvailable IPC messages that need to
+  // be handled. In that case we just ignore them to avoid calling the listener
+  // twice.
+  if (LoadOnStartRequestCalled() && mIPCActorDeleted) {
+    return;
+  }
+
+  // Copy arguments only. It's possible to handle other IPC between
+  // OnStartRequest and DoOnStartRequest.
+  mComputedCrossOriginOpenerPolicy = aArgs.openerPolicy();
+
+  if (!mCanceled && NS_SUCCEEDED(mStatus)) {
+    mStatus = aArgs.channelStatus();
+  }
+
+  // Cookies headers should not be visible to the child process
+  MOZ_ASSERT(!aRequestHeaders.HasHeader(nsHttp::Cookie));
+  MOZ_ASSERT(!nsHttpResponseHead(aResponseHead).HasHeader(nsHttp::Set_Cookie));
+
+  if (aUseResponseHead && !mCanceled) {
+    mResponseHead = MakeUnique<nsHttpResponseHead>(aResponseHead);
+  }
+
+  mSecurityInfo = aArgs.securityInfo();
+
+  ipc::MergeParentLoadInfoForwarder(aArgs.loadInfoForwarder(), mLoadInfo);
+
+  mIsFromCache = aArgs.isFromCache();
+  mIsRacing = aArgs.isRacing();
+  mCacheEntryAvailable = aArgs.cacheEntryAvailable();
+  mCacheEntryId = aArgs.cacheEntryId();
+  mCacheFetchCount = aArgs.cacheFetchCount();
+  mCacheExpirationTime = aArgs.cacheExpirationTime();
+  mSelfAddr = aArgs.selfAddr();
+  mPeerAddr = aArgs.peerAddr();
+
+  mRedirectCount = aArgs.redirectCount();
+  mAvailableCachedAltDataType = aArgs.altDataType();
+  StoreDeliveringAltData(aArgs.deliveringAltData());
+  mAltDataLength = aArgs.altDataLength();
+  StoreResolvedByTRR(aArgs.isResolvedByTRR());
+  mEffectiveTRRMode = aArgs.effectiveTRRMode();
+  mTRRSkipReason = aArgs.trrSkipReason();
+
+  SetApplyConversion(aArgs.applyConversion());
+
+  StoreAfterOnStartRequestBegun(true);
+  StoreHasHTTPSRR(aArgs.hasHTTPSRR());
+
+  AutoEventEnqueuer ensureSerialDispatch(mEventQ);
+
+  mCacheKey = aArgs.cacheKey();
+
+  StoreIsProxyUsed(aArgs.isProxyUsed());
+
+  // replace our request headers with what actually got sent in the parent
+  mRequestHead.SetHeaders(aRequestHeaders);
+
+  // Note: this is where we would notify "http-on-examine-response" observers.
+  // We have deliberately disabled this for child processes (see bug 806753)
+  //
+  // gHttpHandler->OnExamineResponse(this);
+
+  ResourceTimingStructArgsToTimingsStruct(aArgs.timing(), mTransactionTimings);
+
+  nsAutoCString cosString;
+  ClassOfService::ToString(mClassOfService, cosString);
+  if (!mAsyncOpenTime.IsNull() &&
+      !aArgs.timing().transactionPending().IsNull()) {
+    Telemetry::AccumulateTimeDelta(
+        Telemetry::NETWORK_ASYNC_OPEN_CHILD_TO_TRANSACTION_PENDING_EXP_MS,
+        cosString, mAsyncOpenTime, aArgs.timing().transactionPending());
+    PerfStats::RecordMeasurement(
+        PerfStats::Metric::HttpChannelAsyncOpenToTransactionPending,
+        aArgs.timing().transactionPending() - mAsyncOpenTime);
+  }
+
+  if (!aArgs.timing().responseStart().IsNull()) {
+    Telemetry::AccumulateTimeDelta(
+        Telemetry::NETWORK_RESPONSE_START_PARENT_TO_CONTENT_EXP_MS, cosString,
+        aArgs.timing().responseStart(), TimeStamp::Now());
+    PerfStats::RecordMeasurement(
+        PerfStats::Metric::HttpChannelResponseStartParentToContent,
+        TimeStamp::Now() - aArgs.timing().responseStart());
+  }
+
+  StoreAllRedirectsSameOrigin(aArgs.allRedirectsSameOrigin());
+
+  mMultiPartID = aArgs.multiPartID();
+  mIsFirstPartOfMultiPart = aArgs.isFirstPartOfMultiPart();
+  mIsLastPartOfMultiPart = aArgs.isLastPartOfMultiPart();
+
+  if (aArgs.overrideReferrerInfo()) {
+    // The arguments passed to SetReferrerInfoInternal here should mirror the
+    // arguments passed in
+    // nsHttpChannel::ReEvaluateReferrerAfterTrackingStatusIsKnown(), except for
+    // aRespectBeforeConnect which we pass false here since we're intentionally
+    // overriding the referrer after BeginConnect().
+    Unused << SetReferrerInfoInternal(aArgs.overrideReferrerInfo(), false, true,
+                                      false);
+  }
+
+  if (!aArgs.cookie().IsEmpty()) {
+    SetCookie(aArgs.cookie());
+  }
+
+  if (aArgs.shouldWaitForOnStartRequestSent() &&
+      !mRecvOnStartRequestSentCalled) {
+    LOG(("  > pending DoOnStartRequest until RecvOnStartRequestSent\n"));
+    MOZ_ASSERT(NS_IsMainThread());
+
+    mEventQ->Suspend();
+    mSuspendedByWaitingForPermissionCookie = true;
+    mEventQ->PrependEvent(MakeUnique<NeckoTargetChannelFunctionEvent>(
+        this, [self = UnsafePtr<HttpChannelChild>(this)]() {
+          self->DoOnStartRequest(self);
+        }));
+    return;
+  }
+
+  // Remember whether HTTP3 is supported
+  if (mResponseHead) {
+    mSupportsHTTP3 =
+        nsHttpHandler::IsHttp3SupportedByServer(mResponseHead.get());
+  }
+
+  DoOnStartRequest(this);
+}
+
+void HttpChannelChild::ProcessOnAfterLastPart(const nsresult& aStatus) {
+  LOG(("HttpChannelChild::ProcessOnAfterLastPart [this=%p]\n", this));
+  MOZ_ASSERT(OnSocketThread());
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<HttpChannelChild>(this), aStatus]() {
+        self->OnAfterLastPart(aStatus);
+      }));
+}
+
+void HttpChannelChild::OnAfterLastPart(const nsresult& aStatus) {
+  if (LoadOnStopRequestCalled()) {
+    return;
+  }
+  StoreOnStopRequestCalled(true);
+
+  // notify "http-on-stop-connect" observers
+  gHttpHandler->OnStopRequest(this);
+
+  ReleaseListeners();
+
+  // If a preferred alt-data type was set, the parent would hold a reference to
+  // the cache entry in case the child calls openAlternativeOutputStream().
+  // (see nsHttpChannel::OnStopRequest)
+  if (!mPreferredCachedAltDataTypes.IsEmpty()) {
+    mAltDataCacheEntryAvailable = mCacheEntryAvailable;
+  }
+  mCacheEntryAvailable = false;
+
+  if (mLoadGroup) mLoadGroup->RemoveRequest(this, nullptr, mStatus);
+  CleanupBackgroundChannel();
+
+  if (mLoadFlags & LOAD_DOCUMENT_URI) {
+    // Keep IPDL channel open, but only for updating security info.
+    // If IPDL is already closed, then do nothing.
+    if (CanSend()) {
+      mKeptAlive = true;
+      SendDocumentChannelCleanup(true);
+    }
+  } else {
+    // The parent process will respond by sending a DeleteSelf message and
+    // making sure not to send any more messages after that.
+    TrySendDeletingChannel();
+  }
+}
+
+void HttpChannelChild::DoOnStartRequest(nsIRequest* aRequest) {
+  nsresult rv;
+
+  LOG(("HttpChannelChild::DoOnStartRequest [this=%p]\n", this));
+
+  // We handle all the listener chaining before OnStartRequest at this moment.
+  // Prevent additional listeners being added to the chain after the request
+  // as started.
+  StoreTracingEnabled(false);
+
+  // mListener could be null if the redirect setup is not completed.
+  MOZ_ASSERT(mListener || LoadOnStartRequestCalled());
+  if (!mListener) {
+    Cancel(NS_ERROR_FAILURE);
+    return;
+  }
+
+  if (mListener) {
+    nsCOMPtr<nsIStreamListener> listener(mListener);
+    StoreOnStartRequestCalled(true);
+    rv = listener->OnStartRequest(aRequest);
+  } else {
+    rv = NS_ERROR_UNEXPECTED;
+  }
+  StoreOnStartRequestCalled(true);
+
+  if (NS_FAILED(rv)) {
+    CancelWithReason(rv, "HttpChannelChild listener->OnStartRequest failed"_ns);
+    return;
+  }
+
+  nsCOMPtr<nsIStreamListener> listener;
+  rv = DoApplyContentConversions(mListener, getter_AddRefs(listener), nullptr);
+  if (NS_FAILED(rv)) {
+    CancelWithReason(rv,
+                     "HttpChannelChild DoApplyContentConversions failed"_ns);
+  } else if (listener) {
+    mListener = listener;
+    mCompressListener = listener;
+  }
+}
+
+void HttpChannelChild::ProcessOnTransportAndData(
+    const nsresult& aChannelStatus, const nsresult& aTransportStatus,
+    const uint64_t& aOffset, const uint32_t& aCount, const nsACString& aData) {
+  LOG(("HttpChannelChild::ProcessOnTransportAndData [this=%p]\n", this));
+  MOZ_ASSERT(OnSocketThread());
+  mEventQ->RunOrEnqueue(new ChannelFunctionEvent(
+      [self = UnsafePtr<HttpChannelChild>(this)]() {
+        return self->GetODATarget();
+      },
+      [self = UnsafePtr<HttpChannelChild>(this), aChannelStatus,
+       aTransportStatus, aOffset, aCount, aData = nsCString(aData)]() {
+        self->OnTransportAndData(aChannelStatus, aTransportStatus, aOffset,
+                                 aCount, aData);
+      }));
+}
+
+void HttpChannelChild::OnTransportAndData(const nsresult& aChannelStatus,
+                                          const nsresult& aTransportStatus,
+                                          const uint64_t& aOffset,
+                                          const uint32_t& aCount,
+                                          const nsACString& aData) {
+  LOG(("HttpChannelChild::OnTransportAndData [this=%p]\n", this));
+
+  if (!mCanceled && NS_SUCCEEDED(mStatus)) {
+    mStatus = aChannelStatus;
+  }
+
+  if (mCanceled || NS_FAILED(mStatus)) {
+    return;
+  }
+
+  // Hold queue lock throughout all three calls, else we might process a later
+  // necko msg in between them.
+  AutoEventEnqueuer ensureSerialDispatch(mEventQ);
+
+  int64_t progressMax;
+  if (NS_FAILED(GetContentLength(&progressMax))) {
+    progressMax = -1;
+  }
+
+  const int64_t progress = aOffset + aCount;
+
+  // OnTransportAndData will be run on retargeted thread if applicable, however
+  // OnStatus/OnProgress event can only be fired on main thread. We need to
+  // dispatch the status/progress event handling back to main thread with the
+  // appropriate event target for networking.
+  if (NS_IsMainThread()) {
+    DoOnStatus(this, aTransportStatus);
+    DoOnProgress(this, progress, progressMax);
+  } else {
+    RefPtr<HttpChannelChild> self = this;
+    nsCOMPtr<nsISerialEventTarget> neckoTarget = GetNeckoTarget();
+    MOZ_ASSERT(neckoTarget);
+
+    DebugOnly<nsresult> rv = neckoTarget->Dispatch(
+        NS_NewRunnableFunction(
+            "net::HttpChannelChild::OnTransportAndData",
+            [self, aTransportStatus, progress, progressMax]() {
+              self->DoOnStatus(self, aTransportStatus);
+              self->DoOnProgress(self, progress, progressMax);
+            }),
+        NS_DISPATCH_NORMAL);
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+  }
+
+  // OnDataAvailable
+  //
+  // NOTE: the OnDataAvailable contract requires the client to read all the data
+  // in the inputstream.  This code relies on that ('data' will go away after
+  // this function).  Apparently the previous, non-e10s behavior was to actually
+  // support only reading part of the data, allowing later calls to read the
+  // rest.
+  nsCOMPtr<nsIInputStream> stringStream;
+  nsresult rv =
+      NS_NewByteInputStream(getter_AddRefs(stringStream),
+                            Span(aData).To(aCount), NS_ASSIGNMENT_DEPEND);
+  if (NS_FAILED(rv)) {
+    CancelWithReason(rv, "HttpChannelChild NS_NewByteInputStream failed"_ns);
+    return;
+  }
+
+  DoOnDataAvailable(this, stringStream, aOffset, aCount);
+  stringStream->Close();
+
+  // TODO: Bug 1523916 backpressure needs to take into account if the data is
+  // coming from the main process or from the socket process via PBackground.
+  if (NeedToReportBytesRead()) {
+    mUnreportBytesRead += aCount;
+    if (mUnreportBytesRead >= gHttpHandler->SendWindowSize() >> 2) {
+      if (NS_IsMainThread()) {
+        Unused << SendBytesRead(mUnreportBytesRead);
+      } else {
+        // PHttpChannel connects to the main thread
+        RefPtr<HttpChannelChild> self = this;
+        int32_t bytesRead = mUnreportBytesRead;
+        nsCOMPtr<nsISerialEventTarget> neckoTarget = GetNeckoTarget();
+        MOZ_ASSERT(neckoTarget);
+
+        DebugOnly<nsresult> rv = neckoTarget->Dispatch(
+            NS_NewRunnableFunction("net::HttpChannelChild::SendBytesRead",
+                                   [self, bytesRead]() {
+                                     Unused << self->SendBytesRead(bytesRead);
+                                   }),
+            NS_DISPATCH_NORMAL);
+        MOZ_ASSERT(NS_SUCCEEDED(rv));
+      }
+      mUnreportBytesRead = 0;
+    }
+  }
+}
+
+bool HttpChannelChild::NeedToReportBytesRead() {
+  if (mCacheNeedToReportBytesReadInitialized) {
+    return mNeedToReportBytesRead;
+  }
+
+  // Might notify parent for partial cache, and the IPC message is ignored by
+  // parent.
+  int64_t contentLength = -1;
+  if (gHttpHandler->SendWindowSize() == 0 || mIsFromCache ||
+      NS_FAILED(GetContentLength(&contentLength)) ||
+      contentLength < gHttpHandler->SendWindowSize()) {
+    mNeedToReportBytesRead = false;
+  }
+
+  mCacheNeedToReportBytesReadInitialized = true;
+  return mNeedToReportBytesRead;
+}
+
+void HttpChannelChild::DoOnStatus(nsIRequest* aRequest, nsresult status) {
+  LOG(("HttpChannelChild::DoOnStatus [this=%p]\n", this));
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mCanceled) return;
+
+  // cache the progress sink so we don't have to query for it each time.
+  if (!mProgressSink) GetCallback(mProgressSink);
+
+  // block status/progress after Cancel or OnStopRequest has been called,
+  // or if channel has LOAD_BACKGROUND set.
+  if (mProgressSink && NS_SUCCEEDED(mStatus) && LoadIsPending() &&
+      !(mLoadFlags & LOAD_BACKGROUND)) {
+    nsAutoCString host;
+    mURI->GetHost(host);
+    mProgressSink->OnStatus(aRequest, status,
+                            NS_ConvertUTF8toUTF16(host).get());
+  }
+}
+
+void HttpChannelChild::DoOnProgress(nsIRequest* aRequest, int64_t progress,
+                                    int64_t progressMax) {
+  LOG(("HttpChannelChild::DoOnProgress [this=%p]\n", this));
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (mCanceled) return;
+
+  // cache the progress sink so we don't have to query for it each time.
+  if (!mProgressSink) GetCallback(mProgressSink);
+
+  // block status/progress after Cancel or OnStopRequest has been called,
+  // or if channel has LOAD_BACKGROUND set.
+  if (mProgressSink && NS_SUCCEEDED(mStatus) && LoadIsPending()) {
+    // OnProgress
+    //
+    if (progress > 0) {
+      mProgressSink->OnProgress(aRequest, progress, progressMax);
+    }
+  }
+}
+
+void HttpChannelChild::DoOnDataAvailable(nsIRequest* aRequest,
+                                         nsIInputStream* aStream,
+                                         uint64_t aOffset, uint32_t aCount) {
+  AUTO_PROFILER_LABEL("HttpChannelChild::DoOnDataAvailable", NETWORK);
+  LOG(("HttpChannelChild::DoOnDataAvailable [this=%p]\n", this));
+  if (mCanceled) return;
+
+  if (mListener) {
+    nsCOMPtr<nsIStreamListener> listener(mListener);
+    nsresult rv = listener->OnDataAvailable(aRequest, aStream, aOffset, aCount);
+    if (NS_FAILED(rv)) {
+      CancelOnMainThread(rv, "HttpChannelChild OnDataAvailable failed"_ns);
+    }
+  }
+}
+
+void HttpChannelChild::ProcessOnStopRequest(
+    const nsresult& aChannelStatus, const ResourceTimingStructArgs& aTiming,
+    const nsHttpHeaderArray& aResponseTrailers,
+    nsTArray<ConsoleReportCollected>&& aConsoleReports,
+    bool aFromSocketProcess) {
+  LOG(
+      ("HttpChannelChild::ProcessOnStopRequest [this=%p, "
+       "aFromSocketProcess=%d]\n",
+       this, aFromSocketProcess));
+  MOZ_ASSERT(OnSocketThread());
+
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<HttpChannelChild>(this), aChannelStatus, aTiming,
+             aResponseTrailers,
+             consoleReports = CopyableTArray{aConsoleReports.Clone()},
+             aFromSocketProcess]() mutable {
+        self->OnStopRequest(aChannelStatus, aTiming, aResponseTrailers);
+        if (!aFromSocketProcess) {
+          self->DoOnConsoleReport(std::move(consoleReports));
+          self->ContinueOnStopRequest();
+        }
+      }));
+}
+
+void HttpChannelChild::ProcessOnConsoleReport(
+    nsTArray<ConsoleReportCollected>&& aConsoleReports) {
+  LOG(("HttpChannelChild::ProcessOnConsoleReport [this=%p]\n", this));
+  MOZ_ASSERT(OnSocketThread());
+
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this,
+      [self = UnsafePtr<HttpChannelChild>(this),
+       consoleReports = CopyableTArray{aConsoleReports.Clone()}]() mutable {
+        self->DoOnConsoleReport(std::move(consoleReports));
+        self->ContinueOnStopRequest();
+      }));
+}
+
+void HttpChannelChild::DoOnConsoleReport(
+    nsTArray<ConsoleReportCollected>&& aConsoleReports) {
+  if (aConsoleReports.IsEmpty()) {
+    return;
+  }
+
+  for (ConsoleReportCollected& report : aConsoleReports) {
+    if (report.propertiesFile() <
+        nsContentUtils::PropertiesFile::PropertiesFile_COUNT) {
+      AddConsoleReport(report.errorFlags(), report.category(),
+                       nsContentUtils::PropertiesFile(report.propertiesFile()),
+                       report.sourceFileURI(), report.lineNumber(),
+                       report.columnNumber(), report.messageName(),
+                       report.stringParams());
+    }
+  }
+  MaybeFlushConsoleReports();
+}
+
+void HttpChannelChild::OnStopRequest(
+    const nsresult& aChannelStatus, const ResourceTimingStructArgs& aTiming,
+    const nsHttpHeaderArray& aResponseTrailers) {
+  LOG(("HttpChannelChild::OnStopRequest [this=%p status=%" PRIx32 "]\n", this,
+       static_cast<uint32_t>(aChannelStatus)));
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // If this channel was aborted by ActorDestroy, then there may be other
+  // OnStartRequest/OnStopRequest/OnDataAvailable IPC messages that need to
+  // be handled. In that case we just ignore them to avoid calling the listener
+  // twice.
+  if (LoadOnStopRequestCalled() && mIPCActorDeleted) {
+    return;
+  }
+
+  nsCOMPtr<nsICompressConvStats> conv = do_QueryInterface(mCompressListener);
+  if (conv) {
+    conv->GetDecodedDataLength(&mDecodedBodySize);
+  }
+
+  ResourceTimingStructArgsToTimingsStruct(aTiming, mTransactionTimings);
+
+  // Do not overwrite or adjust the original mAsyncOpenTime by timing.fetchStart
+  // We must use the original child process time in order to account for child
+  // side work and IPC transit overhead.
+  // XXX: This depends on TimeStamp being equivalent across processes.
+  // This is true for modern hardware but for older platforms it is not always
+  // true.
+
+  mRedirectStartTimeStamp = aTiming.redirectStart();
+  mRedirectEndTimeStamp = aTiming.redirectEnd();
+  mTransferSize = aTiming.transferSize();
+  mEncodedBodySize = aTiming.encodedBodySize();
+  mProtocolVersion = aTiming.protocolVersion();
+
+  mCacheReadStart = aTiming.cacheReadStart();
+  mCacheReadEnd = aTiming.cacheReadEnd();
+
+  if (profiler_thread_is_being_profiled_for_markers()) {
+    nsAutoCString requestMethod;
+    GetRequestMethod(requestMethod);
+    nsAutoCString contentType;
+    if (mResponseHead) {
+      mResponseHead->ContentType(contentType);
+    }
+    int32_t priority = PRIORITY_NORMAL;
+    GetPriority(&priority);
+    profiler_add_network_marker(
+        mURI, requestMethod, priority, mChannelId, NetworkLoadType::LOAD_STOP,
+        mLastStatusReported, TimeStamp::Now(), mTransferSize, kCacheUnknown,
+        mLoadInfo->GetInnerWindowID(),
+        mLoadInfo->GetOriginAttributes().mPrivateBrowsingId > 0,
+        &mTransactionTimings, std::move(mSource),
+        Some(nsDependentCString(contentType.get())));
+  }
+
+  TimeDuration channelCompletionDuration = TimeStamp::Now() - mAsyncOpenTime;
+  if (mIsFromCache) {
+    PerfStats::RecordMeasurement(PerfStats::Metric::HttpChannelCompletion_Cache,
+                                 channelCompletionDuration);
+  } else {
+    PerfStats::RecordMeasurement(
+        PerfStats::Metric::HttpChannelCompletion_Network,
+        channelCompletionDuration);
+  }
+  PerfStats::RecordMeasurement(PerfStats::Metric::HttpChannelCompletion,
+                               channelCompletionDuration);
+
+  if (!aTiming.responseEnd().IsNull()) {
+    nsAutoCString cosString;
+    ClassOfService::ToString(mClassOfService, cosString);
+    Telemetry::AccumulateTimeDelta(
+        Telemetry::NETWORK_RESPONSE_END_PARENT_TO_CONTENT_MS, cosString,
+        aTiming.responseEnd(), TimeStamp::Now());
+    PerfStats::RecordMeasurement(
+        PerfStats::Metric::HttpChannelResponseEndParentToContent,
+        TimeStamp::Now() - aTiming.responseEnd());
+  }
+
+  mResponseTrailers = MakeUnique<nsHttpHeaderArray>(aResponseTrailers);
+
+  DoPreOnStopRequest(aChannelStatus);
+
+  {  // We must flush the queue before we Send__delete__
+    // (although we really shouldn't receive any msgs after OnStop),
+    // so make sure this goes out of scope before then.
+    AutoEventEnqueuer ensureSerialDispatch(mEventQ);
+
+    DoOnStopRequest(this, aChannelStatus);
+    // DoOnStopRequest() calls ReleaseListeners()
+  }
+}
+
+void HttpChannelChild::ContinueOnStopRequest() {
+  // If we're a multi-part stream, then don't cleanup yet, and we'll do so
+  // in OnAfterLastPart.
+  if (mMultiPartID) {
+    LOG(
+        ("HttpChannelChild::OnStopRequest  - Expecting future parts on a "
+         "multipart channel postpone cleaning up."));
+    return;
+  }
+
+  CleanupBackgroundChannel();
+
+  // If there is a possibility we might want to write alt data to the cache
+  // entry, we keep the channel alive. We still send the DocumentChannelCleanup
+  // message but request the cache entry to be kept by the parent.
+  // If the channel has failed, the cache entry is in a non-writtable state and
+  // we want to release it to not block following consumers.
+  if (NS_SUCCEEDED(mStatus) && !mPreferredCachedAltDataTypes.IsEmpty()) {
+    mKeptAlive = true;
+    SendDocumentChannelCleanup(false);  // don't clear cache entry
+    return;
+  }
+
+  if (mLoadFlags & LOAD_DOCUMENT_URI) {
+    // Keep IPDL channel open, but only for updating security info.
+    // If IPDL is already closed, then do nothing.
+    if (CanSend()) {
+      mKeptAlive = true;
+      SendDocumentChannelCleanup(true);
+    }
+  } else {
+    // The parent process will respond by sending a DeleteSelf message and
+    // making sure not to send any more messages after that.
+    TrySendDeletingChannel();
+  }
+}
+
+void HttpChannelChild::DoPreOnStopRequest(nsresult aStatus) {
+  AUTO_PROFILER_LABEL("HttpChannelChild::DoPreOnStopRequest", NETWORK);
+  LOG(("HttpChannelChild::DoPreOnStopRequest [this=%p status=%" PRIx32 "]\n",
+       this, static_cast<uint32_t>(aStatus)));
+  StoreIsPending(false);
+
+  MaybeReportTimingData();
+
+  if (!mCanceled && NS_SUCCEEDED(mStatus)) {
+    mStatus = aStatus;
+  }
+
+  CollectOMTTelemetry();
+}
+
+void HttpChannelChild::CollectOMTTelemetry() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // Only collect telemetry for HTTP channel that is loaded successfully and
+  // completely.
+  if (mCanceled || NS_FAILED(mStatus)) {
+    return;
+  }
+
+  // Use content policy type to accumulate data by usage.
+  nsAutoCString key(
+      NS_CP_ContentTypeName(mLoadInfo->InternalContentPolicyType()));
+
+  Telemetry::AccumulateCategoricalKeyed(key, mOMTResult);
+}
+
+void HttpChannelChild::DoOnStopRequest(nsIRequest* aRequest,
+                                       nsresult aChannelStatus) {
+  AUTO_PROFILER_LABEL("HttpChannelChild::DoOnStopRequest", NETWORK);
+  LOG(("HttpChannelChild::DoOnStopRequest [this=%p]\n", this));
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!LoadIsPending());
+
+  auto checkForBlockedContent = [&]() {
+    // NB: We use aChannelStatus here instead of mStatus because if there was an
+    // nsCORSListenerProxy on this request, it will override the tracking
+    // protection's return value.
+    if (UrlClassifierFeatureFactory::IsClassifierBlockingErrorCode(
+            aChannelStatus) ||
+        aChannelStatus == NS_ERROR_MALWARE_URI ||
+        aChannelStatus == NS_ERROR_UNWANTED_URI ||
+        aChannelStatus == NS_ERROR_BLOCKED_URI ||
+        aChannelStatus == NS_ERROR_HARMFUL_URI ||
+        aChannelStatus == NS_ERROR_PHISHING_URI) {
+      nsCString list, provider, fullhash;
+
+      nsresult rv = GetMatchedList(list);
+      NS_ENSURE_SUCCESS_VOID(rv);
+
+      rv = GetMatchedProvider(provider);
+      NS_ENSURE_SUCCESS_VOID(rv);
+
+      rv = GetMatchedFullHash(fullhash);
+      NS_ENSURE_SUCCESS_VOID(rv);
+
+      UrlClassifierCommon::SetBlockedContent(this, aChannelStatus, list,
+                                             provider, fullhash);
+    }
+  };
+  checkForBlockedContent();
+
+  MaybeLogCOEPError(aChannelStatus);
+
+  // See bug 1587686. If the redirect setup is not completed, the post-redirect
+  // channel will be not opened and mListener will be null.
+  MOZ_ASSERT(mListener || !LoadWasOpened());
+  if (!mListener) {
+    return;
+  }
+
+  MOZ_ASSERT(!LoadOnStopRequestCalled(),
+             "We should not call OnStopRequest twice");
+
+  if (mListener) {
+    nsCOMPtr<nsIStreamListener> listener(mListener);
+    StoreOnStopRequestCalled(true);
+    listener->OnStopRequest(aRequest, mStatus);
+  }
+  StoreOnStopRequestCalled(true);
+
+  // If we're a multi-part stream, then don't cleanup yet, and we'll do so
+  // in OnAfterLastPart.
+  if (mMultiPartID) {
+    LOG(
+        ("HttpChannelChild::DoOnStopRequest  - Expecting future parts on a "
+         "multipart channel not releasing listeners."));
+    StoreOnStopRequestCalled(false);
+    StoreOnStartRequestCalled(false);
+    return;
+  }
+
+  // notify "http-on-stop-connect" observers
+  gHttpHandler->OnStopRequest(this);
+
+  ReleaseListeners();
+
+  // If a preferred alt-data type was set, the parent would hold a reference to
+  // the cache entry in case the child calls openAlternativeOutputStream().
+  // (see nsHttpChannel::OnStopRequest)
+  if (!mPreferredCachedAltDataTypes.IsEmpty()) {
+    mAltDataCacheEntryAvailable = mCacheEntryAvailable;
+  }
+  mCacheEntryAvailable = false;
+
+  if (mLoadGroup) mLoadGroup->RemoveRequest(this, nullptr, mStatus);
+}
+
+void HttpChannelChild::ProcessOnProgress(const int64_t& aProgress,
+                                         const int64_t& aProgressMax) {
+  MOZ_ASSERT(OnSocketThread());
+  LOG(("HttpChannelChild::ProcessOnProgress [this=%p]\n", this));
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this,
+      [self = UnsafePtr<HttpChannelChild>(this), aProgress, aProgressMax]() {
+        AutoEventEnqueuer ensureSerialDispatch(self->mEventQ);
+        self->DoOnProgress(self, aProgress, aProgressMax);
+      }));
+}
+
+void HttpChannelChild::ProcessOnStatus(const nsresult& aStatus) {
+  MOZ_ASSERT(OnSocketThread());
+  LOG(("HttpChannelChild::ProcessOnStatus [this=%p]\n", this));
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<HttpChannelChild>(this), aStatus]() {
+        AutoEventEnqueuer ensureSerialDispatch(self->mEventQ);
+        self->DoOnStatus(self, aStatus);
+      }));
+}
+
+mozilla::ipc::IPCResult HttpChannelChild::RecvFailedAsyncOpen(
+    const nsresult& aStatus) {
+  LOG(("HttpChannelChild::RecvFailedAsyncOpen [this=%p]\n", this));
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<HttpChannelChild>(this), aStatus]() {
+        self->FailedAsyncOpen(aStatus);
+      }));
+  return IPC_OK();
+}
+
+// We need to have an implementation of this function just so that we can keep
+// all references to mCallOnResume of type HttpChannelChild:  it's not OK in C++
+// to set a member function ptr to a base class function.
+void HttpChannelChild::HandleAsyncAbort() {
+  HttpAsyncAborter<HttpChannelChild>::HandleAsyncAbort();
+
+  // Ignore all the messages from background channel after channel aborted.
+  CleanupBackgroundChannel();
+}
+
+void HttpChannelChild::FailedAsyncOpen(const nsresult& status) {
+  LOG(("HttpChannelChild::FailedAsyncOpen [this=%p status=%" PRIx32 "]\n", this,
+       static_cast<uint32_t>(status)));
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // Might be called twice in race condition in theory.
+  // (one by RecvFailedAsyncOpen, another by
+  // HttpBackgroundChannelChild::ActorFailed)
+  if (LoadOnStartRequestCalled()) {
+    return;
+  }
+
+  if (NS_SUCCEEDED(mStatus)) {
+    mStatus = status;
+  }
+
+  // We're already being called from IPDL, therefore already "async"
+  HandleAsyncAbort();
+
+  if (CanSend()) {
+    TrySendDeletingChannel();
+  }
+}
+
+void HttpChannelChild::CleanupBackgroundChannel() {
+  MutexAutoLock lock(mBgChildMutex);
+
+  AUTO_PROFILER_LABEL("HttpChannelChild::CleanupBackgroundChannel", NETWORK);
+  LOG(("HttpChannelChild::CleanupBackgroundChannel [this=%p bgChild=%p]\n",
+       this, mBgChild.get()));
+
+  mBgInitFailCallback = nullptr;
+
+  if (!mBgChild) {
+    return;
+  }
+
+  RefPtr<HttpBackgroundChannelChild> bgChild = std::move(mBgChild);
+
+  MOZ_RELEASE_ASSERT(gSocketTransportService);
+  if (!OnSocketThread()) {
+    gSocketTransportService->Dispatch(
+        NewRunnableMethod("HttpBackgroundChannelChild::OnChannelClosed",
+                          bgChild,
+                          &HttpBackgroundChannelChild::OnChannelClosed),
+        NS_DISPATCH_NORMAL);
+  } else {
+    bgChild->OnChannelClosed();
+  }
+}
+
+void HttpChannelChild::DoNotifyListenerCleanup() {
+  LOG(("HttpChannelChild::DoNotifyListenerCleanup [this=%p]\n", this));
+}
+
+void HttpChannelChild::DoAsyncAbort(nsresult aStatus) {
+  Unused << AsyncAbort(aStatus);
+}
+
+mozilla::ipc::IPCResult HttpChannelChild::RecvDeleteSelf() {
+  LOG(("HttpChannelChild::RecvDeleteSelf [this=%p]\n", this));
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // The redirection is vetoed. No need to suspend the event queue.
+  if (mSuspendForWaitCompleteRedirectSetup) {
+    mSuspendForWaitCompleteRedirectSetup = false;
+    mEventQ->Resume();
+  }
+
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this,
+      [self = UnsafePtr<HttpChannelChild>(this)]() { self->DeleteSelf(); }));
+  return IPC_OK();
+}
+
+void HttpChannelChild::DeleteSelf() { Send__delete__(this); }
+
+void HttpChannelChild::NotifyOrReleaseListeners(nsresult rv) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (NS_SUCCEEDED(rv) ||
+      (LoadOnStartRequestCalled() && LoadOnStopRequestCalled())) {
+    ReleaseListeners();
+    return;
+  }
+
+  if (NS_SUCCEEDED(mStatus)) {
+    mStatus = rv;
+  }
+
+  // This is enough what we need.  Undelivered notifications will be pushed.
+  // DoNotifyListener ensures the call to ReleaseListeners when done.
+  DoNotifyListener();
+}
+
+void HttpChannelChild::DoNotifyListener() {
+  LOG(("HttpChannelChild::DoNotifyListener this=%p", this));
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // In case nsHttpChannel::OnStartRequest wasn't called (e.g. due to flag
+  // LOAD_ONLY_IF_MODIFIED) we want to set LoadAfterOnStartRequestBegun() to
+  // true before notifying listener.
+  if (!LoadAfterOnStartRequestBegun()) {
+    StoreAfterOnStartRequestBegun(true);
+  }
+
+  if (mListener && !LoadOnStartRequestCalled()) {
+    nsCOMPtr<nsIStreamListener> listener = mListener;
+    StoreOnStartRequestCalled(
+        true);  // avoid reentrancy bugs by setting this now
+    listener->OnStartRequest(this);
+  }
+  StoreOnStartRequestCalled(true);
+
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<HttpChannelChild>(this)] {
+        self->ContinueDoNotifyListener();
+      }));
+}
+
+void HttpChannelChild::ContinueDoNotifyListener() {
+  LOG(("HttpChannelChild::ContinueDoNotifyListener this=%p", this));
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // Make sure IsPending is set to false. At this moment we are done from
+  // the point of view of our consumer and we have to report our self
+  // as not-pending.
+  StoreIsPending(false);
+
+  if (mListener && !LoadOnStopRequestCalled()) {
+    nsCOMPtr<nsIStreamListener> listener = mListener;
+    StoreOnStopRequestCalled(true);
+    listener->OnStopRequest(this, mStatus);
+  }
+  StoreOnStopRequestCalled(true);
+
+  // notify "http-on-stop-request" observers
+  gHttpHandler->OnStopRequest(this);
+
+  // This channel has finished its job, potentially release any tail-blocked
+  // requests with this.
+  RemoveAsNonTailRequest();
+
+  // We have to make sure to drop the references to listeners and callbacks
+  // no longer needed.
+  ReleaseListeners();
+
+  DoNotifyListenerCleanup();
+
+  // If this is a navigation, then we must let the docshell flush the reports
+  // to the console later.  The LoadDocument() is pointing at the detached
+  // document that started the navigation.  We want to show the reports on the
+  // new document.  Otherwise the console is wiped and the user never sees
+  // the information.
+  if (!IsNavigation()) {
+    if (mLoadGroup) {
+      FlushConsoleReports(mLoadGroup);
+    } else {
+      RefPtr<dom::Document> doc;
+      mLoadInfo->GetLoadingDocument(getter_AddRefs(doc));
+      FlushConsoleReports(doc);
+    }
+  }
+}
+
+mozilla::ipc::IPCResult HttpChannelChild::RecvReportSecurityMessage(
+    const nsAString& messageTag, const nsAString& messageCategory) {
+  DebugOnly<nsresult> rv = AddSecurityMessage(messageTag, messageCategory);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult HttpChannelChild::RecvRedirect1Begin(
+    const uint32_t& aRegistrarId, nsIURI* aNewUri,
+    const uint32_t& aNewLoadFlags, const uint32_t& aRedirectFlags,
+    const ParentLoadInfoForwarderArgs& aLoadInfoForwarder,
+    const nsHttpResponseHead& aResponseHead,
+    nsITransportSecurityInfo* aSecurityInfo, const uint64_t& aChannelId,
+    const NetAddr& aOldPeerAddr, const ResourceTimingStructArgs& aTiming) {
+  // TODO: handle security info
+  LOG(("HttpChannelChild::RecvRedirect1Begin [this=%p]\n", this));
+  // We set peer address of child to the old peer,
+  // Then it will be updated to new peer in OnStartRequest
+  mPeerAddr = aOldPeerAddr;
+
+  // Cookies headers should not be visible to the child process
+  MOZ_ASSERT(!nsHttpResponseHead(aResponseHead).HasHeader(nsHttp::Set_Cookie));
+
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<HttpChannelChild>(this), aRegistrarId,
+             newUri = RefPtr{aNewUri}, aNewLoadFlags, aRedirectFlags,
+             aLoadInfoForwarder, aResponseHead,
+             aSecurityInfo = nsCOMPtr{aSecurityInfo}, aChannelId, aTiming]() {
+        self->Redirect1Begin(aRegistrarId, newUri, aNewLoadFlags,
+                             aRedirectFlags, aLoadInfoForwarder, aResponseHead,
+                             aSecurityInfo, aChannelId, aTiming);
+      }));
+  return IPC_OK();
+}
+
+nsresult HttpChannelChild::SetupRedirect(nsIURI* uri,
+                                         const nsHttpResponseHead* responseHead,
+                                         const uint32_t& redirectFlags,
+                                         nsIChannel** outChannel) {
+  LOG(("HttpChannelChild::SetupRedirect [this=%p]\n", this));
+
+  if (mCanceled) {
+    return NS_ERROR_ABORT;
+  }
+
+  nsresult rv;
+  nsCOMPtr<nsIIOService> ioService;
+  rv = gHttpHandler->GetIOService(getter_AddRefs(ioService));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIChannel> newChannel;
+  nsCOMPtr<nsILoadInfo> redirectLoadInfo =
+      CloneLoadInfoForRedirect(uri, redirectFlags);
+  rv = NS_NewChannelInternal(getter_AddRefs(newChannel), uri, redirectLoadInfo,
+                             nullptr,  // PerformanceStorage
+                             nullptr,  // aLoadGroup
+                             nullptr,  // aCallbacks
+                             nsIRequest::LOAD_NORMAL, ioService);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // We won't get OnStartRequest, set cookies here.
+  mResponseHead = MakeUnique<nsHttpResponseHead>(*responseHead);
+
+  bool rewriteToGET = HttpBaseChannel::ShouldRewriteRedirectToGET(
+      mResponseHead->Status(), mRequestHead.ParsedMethod());
+
+  rv = SetupReplacementChannel(uri, newChannel, !rewriteToGET, redirectFlags);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mRedirectChannelChild = do_QueryInterface(newChannel);
+  newChannel.forget(outChannel);
+
+  return NS_OK;
+}
+
+void HttpChannelChild::Redirect1Begin(
+    const uint32_t& registrarId, nsIURI* newOriginalURI,
+    const uint32_t& newLoadFlags, const uint32_t& redirectFlags,
+    const ParentLoadInfoForwarderArgs& loadInfoForwarder,
+    const nsHttpResponseHead& responseHead,
+    nsITransportSecurityInfo* securityInfo, const uint64_t& channelId,
+    const ResourceTimingStructArgs& timing) {
+  nsresult rv;
+
+  LOG(("HttpChannelChild::Redirect1Begin [this=%p]\n", this));
+
+  MOZ_ASSERT(newOriginalURI, "newOriginalURI should not be null");
+
+  ipc::MergeParentLoadInfoForwarder(loadInfoForwarder, mLoadInfo);
+  ResourceTimingStructArgsToTimingsStruct(timing, mTransactionTimings);
+
+  if (profiler_thread_is_being_profiled_for_markers()) {
+    nsAutoCString requestMethod;
+    GetRequestMethod(requestMethod);
+    nsAutoCString contentType;
+    responseHead.ContentType(contentType);
+
+    profiler_add_network_marker(
+        mURI, requestMethod, mPriority, mChannelId,
+        NetworkLoadType::LOAD_REDIRECT, mLastStatusReported, TimeStamp::Now(),
+        0, kCacheUnknown, mLoadInfo->GetInnerWindowID(),
+        mLoadInfo->GetOriginAttributes().mPrivateBrowsingId > 0,
+        &mTransactionTimings, std::move(mSource),
+        Some(nsDependentCString(contentType.get())), newOriginalURI,
+        redirectFlags, channelId);
+  }
+
+  mSecurityInfo = securityInfo;
+
+  nsCOMPtr<nsIChannel> newChannel;
+  rv = SetupRedirect(newOriginalURI, &responseHead, redirectFlags,
+                     getter_AddRefs(newChannel));
+
+  if (NS_SUCCEEDED(rv)) {
+    MOZ_ALWAYS_SUCCEEDS(newChannel->SetLoadFlags(newLoadFlags));
+
+    if (mRedirectChannelChild) {
+      // Set the channelId allocated in parent to the child instance
+      nsCOMPtr<nsIHttpChannel> httpChannel =
+          do_QueryInterface(mRedirectChannelChild);
+      if (httpChannel) {
+        rv = httpChannel->SetChannelId(channelId);
+        MOZ_ASSERT(NS_SUCCEEDED(rv));
+      }
+      mRedirectChannelChild->ConnectParent(registrarId);
+    }
+
+    nsCOMPtr<nsISerialEventTarget> target = GetNeckoTarget();
+    MOZ_ASSERT(target);
+
+    rv = gHttpHandler->AsyncOnChannelRedirect(this, newChannel, redirectFlags,
+                                              target);
+  }
+
+  if (NS_FAILED(rv)) OnRedirectVerifyCallback(rv);
+}
+
+mozilla::ipc::IPCResult HttpChannelChild::RecvRedirect3Complete() {
+  LOG(("HttpChannelChild::RecvRedirect3Complete [this=%p]\n", this));
+  nsCOMPtr<nsIChannel> redirectChannel =
+      do_QueryInterface(mRedirectChannelChild);
+  MOZ_ASSERT(redirectChannel);
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<HttpChannelChild>(this), redirectChannel]() {
+        nsresult rv = NS_OK;
+        Unused << self->GetStatus(&rv);
+        if (NS_FAILED(rv)) {
+          // Pre-redirect channel was canceled. Call |HandleAsyncAbort|, so
+          // mListener's OnStart/StopRequest can be called. Nothing else will
+          // trigger these notification after this point.
+          // We do this before |CompleteRedirectSetup|, so post-redirect channel
+          // stays unopened and we also make sure that OnStart/StopRequest won't
+          // be called twice.
+          self->HandleAsyncAbort();
+
+          nsCOMPtr<nsIHttpChannelChild> chan =
+              do_QueryInterface(redirectChannel);
+          RefPtr<HttpChannelChild> httpChannelChild =
+              static_cast<HttpChannelChild*>(chan.get());
+          if (httpChannelChild) {
+            // For sending an IPC message to parent channel so that the loading
+            // can be cancelled.
+            Unused << httpChannelChild->CancelWithReason(
+                rv, "HttpChannelChild Redirect3 failed"_ns);
+
+            // The post-redirect channel could still get OnStart/StopRequest IPC
+            // messages from parent, but the mListener is still null. So, we
+            // call |DoNotifyListener| to pretend that OnStart/StopRequest are
+            // already called.
+            httpChannelChild->DoNotifyListener();
+          }
+          return;
+        }
+
+        self->Redirect3Complete();
+      }));
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult HttpChannelChild::RecvRedirectFailed(
+    const nsresult& status) {
+  LOG(("HttpChannelChild::RecvRedirectFailed this=%p status=%X\n", this,
+       static_cast<uint32_t>(status)));
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<HttpChannelChild>(this), status]() {
+        nsCOMPtr<nsIRedirectResultListener> vetoHook;
+        self->GetCallback(vetoHook);
+        if (vetoHook) {
+          vetoHook->OnRedirectResult(status);
+        }
+
+        if (RefPtr<HttpChannelChild> httpChannelChild =
+                do_QueryObject(self->mRedirectChannelChild)) {
+          // For sending an IPC message to parent channel so that the loading
+          // can be cancelled.
+          Unused << httpChannelChild->CancelWithReason(
+              status, "HttpChannelChild RecvRedirectFailed"_ns);
+
+          // The post-redirect channel could still get OnStart/StopRequest IPC
+          // messages from parent, but the mListener is still null. So, we
+          // call |DoNotifyListener| to pretend that OnStart/StopRequest are
+          // already called.
+          httpChannelChild->DoNotifyListener();
+        }
+      }));
+
+  return IPC_OK();
+}
+
+void HttpChannelChild::ProcessNotifyClassificationFlags(
+    uint32_t aClassificationFlags, bool aIsThirdParty) {
+  LOG(
+      ("HttpChannelChild::ProcessNotifyClassificationFlags thirdparty=%d "
+       "flags=%" PRIu32 " [this=%p]\n",
+       static_cast<int>(aIsThirdParty), aClassificationFlags, this));
+  MOZ_ASSERT(OnSocketThread());
+
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<HttpChannelChild>(this), aClassificationFlags,
+             aIsThirdParty]() {
+        self->AddClassificationFlags(aClassificationFlags, aIsThirdParty);
+      }));
+}
+
+void HttpChannelChild::ProcessSetClassifierMatchedInfo(
+    const nsACString& aList, const nsACString& aProvider,
+    const nsACString& aFullHash) {
+  LOG(("HttpChannelChild::ProcessSetClassifierMatchedInfo [this=%p]\n", this));
+  MOZ_ASSERT(OnSocketThread());
+
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this,
+      [self = UnsafePtr<HttpChannelChild>(this), aList = nsCString(aList),
+       aProvider = nsCString(aProvider), aFullHash = nsCString(aFullHash)]() {
+        self->SetMatchedInfo(aList, aProvider, aFullHash);
+      }));
+}
+
+void HttpChannelChild::ProcessSetClassifierMatchedTrackingInfo(
+    const nsACString& aLists, const nsACString& aFullHashes) {
+  LOG(("HttpChannelChild::ProcessSetClassifierMatchedTrackingInfo [this=%p]\n",
+       this));
+  MOZ_ASSERT(OnSocketThread());
+
+  nsTArray<nsCString> lists, fullhashes;
+  for (const nsACString& token : aLists.Split(',')) {
+    lists.AppendElement(token);
+  }
+  for (const nsACString& token : aFullHashes.Split(',')) {
+    fullhashes.AppendElement(token);
+  }
+
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<HttpChannelChild>(this),
+             lists = CopyableTArray{std::move(lists)},
+             fullhashes = CopyableTArray{std::move(fullhashes)}]() {
+        self->SetMatchedTrackingInfo(lists, fullhashes);
+      }));
+}
+
+// Completes the redirect and cleans up the old channel.
+void HttpChannelChild::Redirect3Complete() {
+  LOG(("HttpChannelChild::Redirect3Complete [this=%p]\n", this));
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // Using an error as the default so that when we fail to forward this redirect
+  // to the target channel, we make sure to notify the current listener from
+  // CleanupRedirectingChannel.
+  nsresult rv = NS_BINDING_ABORTED;
+
+  nsCOMPtr<nsIRedirectResultListener> vetoHook;
+  GetCallback(vetoHook);
+  if (vetoHook) {
+    vetoHook->OnRedirectResult(NS_OK);
+  }
+
+  // Chrome channel has been AsyncOpen'd.  Reflect this in child.
+  if (mRedirectChannelChild) {
+    rv = mRedirectChannelChild->CompleteRedirectSetup(mListener);
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+    mSuccesfullyRedirected = NS_SUCCEEDED(rv);
+#endif
+  }
+
+  CleanupRedirectingChannel(rv);
+}
+
+void HttpChannelChild::CleanupRedirectingChannel(nsresult rv) {
+  // Redirecting to new channel: shut this down and init new channel
+  if (mLoadGroup) mLoadGroup->RemoveRequest(this, nullptr, NS_BINDING_ABORTED);
+
+  if (NS_SUCCEEDED(rv)) {
+    mLoadInfo->AppendRedirectHistoryEntry(this, false);
+  } else {
+    NS_WARNING("CompleteRedirectSetup failed, HttpChannelChild already open?");
+  }
+
+  // Release ref to new channel.
+  mRedirectChannelChild = nullptr;
+
+  NotifyOrReleaseListeners(rv);
+  CleanupBackgroundChannel();
+}
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsIChildChannel
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+HttpChannelChild::ConnectParent(uint32_t registrarId) {
+  LOG(("HttpChannelChild::ConnectParent [this=%p, id=%" PRIu32 "]\n", this,
+       registrarId));
+  MOZ_ASSERT(NS_IsMainThread());
+  mozilla::dom::BrowserChild* browserChild = nullptr;
+  nsCOMPtr<nsIBrowserChild> iBrowserChild;
+  GetCallback(iBrowserChild);
+  if (iBrowserChild) {
+    browserChild =
+        static_cast<mozilla::dom::BrowserChild*>(iBrowserChild.get());
+  }
+
+  if (browserChild && !browserChild->IPCOpen()) {
+    return NS_ERROR_FAILURE;
+  }
+
+  ContentChild* cc = static_cast<ContentChild*>(gNeckoChild->Manager());
+  if (cc->IsShuttingDown()) {
+    return NS_ERROR_FAILURE;
+  }
+
+  HttpBaseChannel::SetDocshellUserAgentOverride();
+
+  // This must happen before the constructor message is sent. Otherwise messages
+  // from the parent could arrive quickly and be delivered to the wrong event
+  // target.
+  SetEventTarget();
+
+  if (browserChild) {
+    MOZ_ASSERT(browserChild->WebNavigation());
+    if (BrowsingContext* bc = browserChild->GetBrowsingContext()) {
+      mBrowserId = bc->BrowserId();
+    }
+  }
+
+  HttpChannelConnectArgs connectArgs(registrarId);
+  if (!gNeckoChild->SendPHttpChannelConstructor(
+          this, browserChild, IPC::SerializedLoadContext(this), connectArgs)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  {
+    MutexAutoLock lock(mBgChildMutex);
+
+    MOZ_ASSERT(!mBgChild);
+    MOZ_ASSERT(!mBgInitFailCallback);
+
+    mBgInitFailCallback = NewRunnableMethod<nsresult>(
+        "HttpChannelChild::OnRedirectVerifyCallback", this,
+        &HttpChannelChild::OnRedirectVerifyCallback, NS_ERROR_FAILURE);
+
+    RefPtr<HttpBackgroundChannelChild> bgChild =
+        new HttpBackgroundChannelChild();
+
+    MOZ_RELEASE_ASSERT(gSocketTransportService);
+
+    RefPtr<HttpChannelChild> self = this;
+    nsresult rv = gSocketTransportService->Dispatch(
+        NewRunnableMethod<RefPtr<HttpChannelChild>>(
+            "HttpBackgroundChannelChild::Init", bgChild,
+            &HttpBackgroundChannelChild::Init, std::move(self)),
+        NS_DISPATCH_NORMAL);
+
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    mBgChild = std::move(bgChild);
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+    mEverHadBgChildAtConnectParent = true;
+#endif
+  }
+
+  // Should wait for CompleteRedirectSetup to set the listener.
+  mEventQ->Suspend();
+  MOZ_ASSERT(!mSuspendForWaitCompleteRedirectSetup);
+  mSuspendForWaitCompleteRedirectSetup = true;
+
+  // Connect to socket process after mEventQ is suspended.
+  MaybeConnectToSocketProcess();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::CompleteRedirectSetup(nsIStreamListener* aListener) {
+  LOG(("HttpChannelChild::CompleteRedirectSetup [this=%p]\n", this));
+  MOZ_ASSERT(NS_IsMainThread());
+
+  NS_ENSURE_TRUE(!LoadIsPending(), NS_ERROR_IN_PROGRESS);
+  NS_ENSURE_TRUE(!LoadWasOpened(), NS_ERROR_ALREADY_OPENED);
+
+  // Resume the suspension in ConnectParent.
+  auto eventQueueResumeGuard = MakeScopeExit([&] {
+    MOZ_ASSERT(mSuspendForWaitCompleteRedirectSetup);
+    mEventQ->Resume();
+    mSuspendForWaitCompleteRedirectSetup = false;
+  });
+
+  /*
+   * No need to check for cancel: we don't get here if nsHttpChannel canceled
+   * before AsyncOpen(); if it's canceled after that, OnStart/Stop will just
+   * get called with error code as usual.  So just setup mListener and make the
+   * channel reflect AsyncOpen'ed state.
+   */
+
+  mLastStatusReported = TimeStamp::Now();
+  if (profiler_thread_is_being_profiled_for_markers()) {
+    nsAutoCString requestMethod;
+    GetRequestMethod(requestMethod);
+
+    profiler_add_network_marker(
+        mURI, requestMethod, mPriority, mChannelId, NetworkLoadType::LOAD_START,
+        mChannelCreationTimestamp, mLastStatusReported, 0, kCacheUnknown,
+        mLoadInfo->GetInnerWindowID(),
+        mLoadInfo->GetOriginAttributes().mPrivateBrowsingId > 0);
+  }
+  StoreIsPending(true);
+  StoreWasOpened(true);
+  mListener = aListener;
+
+  // add ourselves to the load group.
+  if (mLoadGroup) mLoadGroup->AddRequest(this, nullptr);
+
+  // We already have an open IPDL connection to the parent. If on-modify-request
+  // listeners or load group observers canceled us, let the parent handle it
+  // and send it back to us naturally.
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsIAsyncVerifyRedirectCallback
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+HttpChannelChild::OnRedirectVerifyCallback(nsresult aResult) {
+  LOG(("HttpChannelChild::OnRedirectVerifyCallback [this=%p]\n", this));
+  MOZ_ASSERT(NS_IsMainThread());
+  nsCOMPtr<nsIURI> redirectURI;
+
+  DebugOnly<nsresult> rv = NS_OK;
+
+  nsCOMPtr<nsIHttpChannel> newHttpChannel =
+      do_QueryInterface(mRedirectChannelChild);
+
+  if (NS_SUCCEEDED(aResult) && !mRedirectChannelChild) {
+    // mRedirectChannelChild doesn't exist means we're redirecting to a protocol
+    // that doesn't implement nsIChildChannel. The redirect result should be set
+    // as failed by veto listeners and shouldn't enter this condition. As the
+    // last resort, we synthesize the error result as NS_ERROR_DOM_BAD_URI here
+    // to let nsHttpChannel::ContinueProcessResponse2 know it's redirecting to
+    // another protocol and throw an error.
+    LOG(("  redirecting to a protocol that doesn't implement nsIChildChannel"));
+    aResult = NS_ERROR_DOM_BAD_URI;
+  }
+
+  nsCOMPtr<nsIReferrerInfo> referrerInfo;
+  if (newHttpChannel) {
+    // Must not be called until after redirect observers called.
+    newHttpChannel->SetOriginalURI(mOriginalURI);
+    referrerInfo = newHttpChannel->GetReferrerInfo();
+  }
+
+  RequestHeaderTuples emptyHeaders;
+  RequestHeaderTuples* headerTuples = &emptyHeaders;
+  nsLoadFlags loadFlags = 0;
+  Maybe<CorsPreflightArgs> corsPreflightArgs;
+
+  nsCOMPtr<nsIHttpChannelChild> newHttpChannelChild =
+      do_QueryInterface(mRedirectChannelChild);
+  if (newHttpChannelChild && NS_SUCCEEDED(aResult)) {
+    rv = newHttpChannelChild->AddCookiesToRequest();
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+    rv = newHttpChannelChild->GetClientSetRequestHeaders(&headerTuples);
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+    newHttpChannelChild->GetClientSetCorsPreflightParameters(corsPreflightArgs);
+  }
+
+  if (NS_SUCCEEDED(aResult)) {
+    // Note: this is where we would notify "http-on-modify-response" observers.
+    // We have deliberately disabled this for child processes (see bug 806753)
+    //
+    // After we verify redirect, nsHttpChannel may hit the network: must give
+    // "http-on-modify-request" observers the chance to cancel before that.
+    // base->CallOnModifyRequestObservers();
+
+    nsCOMPtr<nsIHttpChannelInternal> newHttpChannelInternal =
+        do_QueryInterface(mRedirectChannelChild);
+    if (newHttpChannelInternal) {
+      Unused << newHttpChannelInternal->GetApiRedirectToURI(
+          getter_AddRefs(redirectURI));
+    }
+
+    nsCOMPtr<nsIRequest> request = do_QueryInterface(mRedirectChannelChild);
+    if (request) {
+      request->GetLoadFlags(&loadFlags);
+    }
+  }
+
+  uint32_t sourceRequestBlockingReason = 0;
+  mLoadInfo->GetRequestBlockingReason(&sourceRequestBlockingReason);
+
+  Maybe<ChildLoadInfoForwarderArgs> targetLoadInfoForwarder;
+  nsCOMPtr<nsIChannel> newChannel = do_QueryInterface(mRedirectChannelChild);
+  if (newChannel) {
+    ChildLoadInfoForwarderArgs args;
+    nsCOMPtr<nsILoadInfo> loadInfo = newChannel->LoadInfo();
+    LoadInfoToChildLoadInfoForwarder(loadInfo, &args);
+    targetLoadInfoForwarder.emplace(args);
+  }
+
+  if (CanSend()) {
+    SendRedirect2Verify(aResult, *headerTuples, sourceRequestBlockingReason,
+                        targetLoadInfoForwarder, loadFlags, referrerInfo,
+                        redirectURI, corsPreflightArgs);
+  }
+
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsIRequest
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP HttpChannelChild::SetCanceledReason(const nsACString& aReason) {
+  return SetCanceledReasonImpl(aReason);
+}
+
+NS_IMETHODIMP HttpChannelChild::GetCanceledReason(nsACString& aReason) {
+  return GetCanceledReasonImpl(aReason);
+}
+
+NS_IMETHODIMP
+HttpChannelChild::CancelWithReason(nsresult aStatus,
+                                   const nsACString& aReason) {
+  return CancelWithReasonImpl(aStatus, aReason);
+}
+
+NS_IMETHODIMP
+HttpChannelChild::Cancel(nsresult aStatus) {
+  LOG(("HttpChannelChild::Cancel [this=%p, status=%" PRIx32 "]\n", this,
+       static_cast<uint32_t>(aStatus)));
+  // only logging on parent is necessary
+  Maybe<nsCString> logStack = CallingScriptLocationString();
+  Maybe<nsCString> logOnParent;
+  if (logStack.isSome()) {
+    logOnParent = Some(""_ns);
+    logOnParent->AppendPrintf(
+        "[this=%p] cancelled call in child process from script: %s", this,
+        logStack->get());
+  }
+
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!mCanceled) {
+    // If this cancel occurs before nsHttpChannel has been set up, AsyncOpen
+    // is responsible for cleaning up.
+    mCanceled = true;
+    mStatus = aStatus;
+
+    bool remoteChannelExists = RemoteChannelExists();
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+    mCanSendAtCancel = CanSend();
+    mRemoteChannelExistedAtCancel = remoteChannelExists;
+#endif
+
+    if (remoteChannelExists) {
+      SendCancel(aStatus, mLoadInfo->GetRequestBlockingReason(),
+                 mCanceledReason, logOnParent);
+    } else if (MOZ_UNLIKELY(!LoadOnStartRequestCalled() ||
+                            !LoadOnStopRequestCalled())) {
+      Unused << AsyncAbort(mStatus);
+    }
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::Suspend() {
+  LOG(("HttpChannelChild::Suspend [this=%p, mSuspendCount=%" PRIu32 "\n", this,
+       mSuspendCount + 1));
+  MOZ_ASSERT(NS_IsMainThread());
+
+  LogCallingScriptLocation(this);
+
+  // SendSuspend only once, when suspend goes from 0 to 1.
+  // Don't SendSuspend at all if we're diverting callbacks to the parent;
+  // suspend will be called at the correct time in the parent itself.
+  if (!mSuspendCount++) {
+    if (RemoteChannelExists()) {
+      SendSuspend();
+      mSuspendSent = true;
+    }
+  }
+  mEventQ->Suspend();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::Resume() {
+  LOG(("HttpChannelChild::Resume [this=%p, mSuspendCount=%" PRIu32 "\n", this,
+       mSuspendCount - 1));
+  MOZ_ASSERT(NS_IsMainThread());
+  NS_ENSURE_TRUE(mSuspendCount > 0, NS_ERROR_UNEXPECTED);
+
+  LogCallingScriptLocation(this);
+
+  nsresult rv = NS_OK;
+
+  // SendResume only once, when suspend count drops to 0.
+  // Don't SendResume at all if we're diverting callbacks to the parent (unless
+  // suspend was sent earlier); otherwise, resume will be called at the correct
+  // time in the parent itself.
+  if (!--mSuspendCount) {
+    if (RemoteChannelExists() && mSuspendSent) {
+      SendResume();
+    }
+    if (mCallOnResume) {
+      nsCOMPtr<nsISerialEventTarget> neckoTarget = GetNeckoTarget();
+      MOZ_ASSERT(neckoTarget);
+
+      RefPtr<HttpChannelChild> self = this;
+      std::function<nsresult(HttpChannelChild*)> callOnResume = nullptr;
+      std::swap(callOnResume, mCallOnResume);
+      rv = neckoTarget->Dispatch(
+          NS_NewRunnableFunction(
+              "net::HttpChannelChild::mCallOnResume",
+              [callOnResume, self{std::move(self)}]() { callOnResume(self); }),
+          NS_DISPATCH_NORMAL);
+    }
+  }
+  mEventQ->Resume();
+
+  return rv;
+}
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsIChannel
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+HttpChannelChild::GetSecurityInfo(nsITransportSecurityInfo** aSecurityInfo) {
+  NS_ENSURE_ARG_POINTER(aSecurityInfo);
+  *aSecurityInfo = do_AddRef(mSecurityInfo).take();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::AsyncOpen(nsIStreamListener* aListener) {
+  LOG(("HttpChannelChild::AsyncOpen [this=%p uri=%s]\n", this, mSpec.get()));
+
+  nsresult rv = AsyncOpenInternal(aListener);
+  if (NS_FAILED(rv)) {
+    uint32_t blockingReason = 0;
+    mLoadInfo->GetRequestBlockingReason(&blockingReason);
+    LOG(
+        ("HttpChannelChild::AsyncOpen failed [this=%p rv=0x%08x "
+         "blocking-reason=%u]\n",
+         this, static_cast<uint32_t>(rv), blockingReason));
+
+    gHttpHandler->OnFailedOpeningRequest(this);
+  }
+
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+  mAsyncOpenSucceeded = NS_SUCCEEDED(rv);
+#endif
+  return rv;
+}
+
+nsresult HttpChannelChild::AsyncOpenInternal(nsIStreamListener* aListener) {
+  nsresult rv;
+
+  nsCOMPtr<nsIStreamListener> listener = aListener;
+  rv = nsContentSecurityManager::doContentSecurityCheck(this, listener);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    ReleaseListeners();
+    return rv;
+  }
+
+  MOZ_ASSERT(
+      mLoadInfo->GetSecurityMode() == 0 ||
+          mLoadInfo->GetInitialSecurityCheckDone() ||
+          (mLoadInfo->GetSecurityMode() ==
+               nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_SEC_CONTEXT_IS_NULL &&
+           mLoadInfo->GetLoadingPrincipal() &&
+           mLoadInfo->GetLoadingPrincipal()->IsSystemPrincipal()),
+      "security flags in loadInfo but doContentSecurityCheck() not called");
+
+  LogCallingScriptLocation(this);
+
+  if (!mLoadGroup && !mCallbacks) {
+    // If no one called SetLoadGroup or SetNotificationCallbacks, the private
+    // state has not been updated on PrivateBrowsingChannel (which we derive
+    // from) Hence, we have to call UpdatePrivateBrowsing() here
+    UpdatePrivateBrowsing();
+  }
+
+#ifdef DEBUG
+  AssertPrivateBrowsingId();
+#endif
+
+  if (mCanceled) {
+    ReleaseListeners();
+    return mStatus;
+  }
+
+  NS_ENSURE_TRUE(gNeckoChild != nullptr, NS_ERROR_FAILURE);
+  NS_ENSURE_ARG_POINTER(listener);
+  NS_ENSURE_TRUE(!LoadIsPending(), NS_ERROR_IN_PROGRESS);
+  NS_ENSURE_TRUE(!LoadWasOpened(), NS_ERROR_ALREADY_OPENED);
+
+  if (MaybeWaitForUploadStreamNormalization(listener, nullptr)) {
+    return NS_OK;
+  }
+
+  if (!LoadAsyncOpenTimeOverriden()) {
+    mAsyncOpenTime = TimeStamp::Now();
+  }
+
+  // Port checked in parent, but duplicate here so we can return with error
+  // immediately
+  rv = NS_CheckPortSafety(mURI);
+  if (NS_FAILED(rv)) {
+    ReleaseListeners();
+    return rv;
+  }
+
+  nsAutoCString cookie;
+  if (NS_SUCCEEDED(mRequestHead.GetHeader(nsHttp::Cookie, cookie))) {
+    mUserSetCookieHeader = cookie;
+  }
+
+  DebugOnly<nsresult> check = AddCookiesToRequest();
+  MOZ_ASSERT(NS_SUCCEEDED(check));
+
+  //
+  // NOTE: From now on we must return NS_OK; all errors must be handled via
+  // OnStart/OnStopRequest
+  //
+
+  // We notify "http-on-opening-request" observers in the child
+  // process so that devtools can capture a stack trace at the
+  // appropriate spot.  See bug 806753 for some information about why
+  // other http-* notifications are disabled in child processes.
+  gHttpHandler->OnOpeningRequest(this);
+
+  mLastStatusReported = TimeStamp::Now();
+  if (profiler_thread_is_being_profiled_for_markers()) {
+    nsAutoCString requestMethod;
+    GetRequestMethod(requestMethod);
+
+    profiler_add_network_marker(
+        mURI, requestMethod, mPriority, mChannelId, NetworkLoadType::LOAD_START,
+        mChannelCreationTimestamp, mLastStatusReported, 0, kCacheUnknown,
+        mLoadInfo->GetInnerWindowID(),
+        mLoadInfo->GetOriginAttributes().mPrivateBrowsingId > 0);
+  }
+  StoreIsPending(true);
+  StoreWasOpened(true);
+  mListener = listener;
+
+  // add ourselves to the load group.
+  if (mLoadGroup) mLoadGroup->AddRequest(this, nullptr);
+
+  if (mCanceled) {
+    // We may have been canceled already, either by on-modify-request
+    // listeners or by load group observers; in that case, don't create IPDL
+    // connection. See nsHttpChannel::AsyncOpen().
+    ReleaseListeners();
+    return mStatus;
+  }
+
+  // Set user agent override from docshell
+  HttpBaseChannel::SetDocshellUserAgentOverride();
+
+  rv = ContinueAsyncOpen();
+  if (NS_FAILED(rv)) {
+    ReleaseListeners();
+  }
+  return rv;
+}
+
+// Assigns an nsISerialEventTarget to our IPDL actor so that IPC messages are
+// sent to the correct DocGroup/TabGroup.
+void HttpChannelChild::SetEventTarget() {
+  nsCOMPtr<nsILoadInfo> loadInfo = LoadInfo();
+
+  nsCOMPtr<nsISerialEventTarget> target =
+      nsContentUtils::GetEventTargetByLoadInfo(loadInfo, TaskCategory::Network);
+
+  if (!target) {
+    return;
+  }
+
+  {
+    MutexAutoLock lock(mEventTargetMutex);
+    mNeckoTarget = target;
+  }
+}
+
+already_AddRefed<nsISerialEventTarget> HttpChannelChild::GetNeckoTarget() {
+  nsCOMPtr<nsISerialEventTarget> target;
+  {
+    MutexAutoLock lock(mEventTargetMutex);
+    target = mNeckoTarget;
+  }
+
+  if (!target) {
+    target = GetMainThreadSerialEventTarget();
+  }
+  return target.forget();
+}
+
+already_AddRefed<nsIEventTarget> HttpChannelChild::GetODATarget() {
+  nsCOMPtr<nsIEventTarget> target;
+  {
+    MutexAutoLock lock(mEventTargetMutex);
+    if (mODATarget) {
+      target = mODATarget;
+    } else {
+      target = mNeckoTarget;
+    }
+  }
+
+  if (!target) {
+    target = GetMainThreadSerialEventTarget();
+  }
+  return target.forget();
+}
+
+nsresult HttpChannelChild::ContinueAsyncOpen() {
+  nsresult rv;
+  //
+  // Send request to the chrome process...
+  //
+
+  mozilla::dom::BrowserChild* browserChild = nullptr;
+  nsCOMPtr<nsIBrowserChild> iBrowserChild;
+  GetCallback(iBrowserChild);
+  if (iBrowserChild) {
+    browserChild =
+        static_cast<mozilla::dom::BrowserChild*>(iBrowserChild.get());
+  }
+
+  // This id identifies the inner window's top-level document,
+  // which changes on every new load or navigation.
+  uint64_t contentWindowId = 0;
+  TimeStamp navigationStartTimeStamp;
+  if (browserChild) {
+    MOZ_ASSERT(browserChild->WebNavigation());
+    if (RefPtr<Document> document = browserChild->GetTopLevelDocument()) {
+      contentWindowId = document->InnerWindowID();
+      nsDOMNavigationTiming* navigationTiming = document->GetNavigationTiming();
+      if (navigationTiming) {
+        navigationStartTimeStamp =
+            navigationTiming->GetNavigationStartTimeStamp();
+      }
+    }
+    if (BrowsingContext* bc = browserChild->GetBrowsingContext()) {
+      mBrowserId = bc->BrowserId();
+    }
+  }
+  SetTopLevelContentWindowId(contentWindowId);
+
+  HttpChannelOpenArgs openArgs;
+  // No access to HttpChannelOpenArgs members, but they each have a
+  // function with the struct name that returns a ref.
+  openArgs.uri() = mURI;
+  openArgs.original() = mOriginalURI;
+  openArgs.doc() = mDocumentURI;
+  openArgs.apiRedirectTo() = mAPIRedirectToURI;
+  openArgs.loadFlags() = mLoadFlags;
+  openArgs.requestHeaders() = mClientSetRequestHeaders;
+  mRequestHead.Method(openArgs.requestMethod());
+  openArgs.preferredAlternativeTypes() = mPreferredCachedAltDataTypes.Clone();
+  openArgs.referrerInfo() = mReferrerInfo;
+
+  if (mUploadStream) {
+    MOZ_ALWAYS_TRUE(SerializeIPCStream(do_AddRef(mUploadStream),
+                                       openArgs.uploadStream(),
+                                       /* aAllowLazy */ false));
+  }
+
+  Maybe<CorsPreflightArgs> optionalCorsPreflightArgs;
+  GetClientSetCorsPreflightParameters(optionalCorsPreflightArgs);
+
+  // NB: This call forces us to cache mTopWindowURI if we haven't already.
+  nsCOMPtr<nsIURI> uri;
+  GetTopWindowURI(mURI, getter_AddRefs(uri));
+
+  openArgs.topWindowURI() = mTopWindowURI;
+
+  openArgs.preflightArgs() = optionalCorsPreflightArgs;
+
+  openArgs.uploadStreamHasHeaders() = LoadUploadStreamHasHeaders();
+  openArgs.priority() = mPriority;
+  openArgs.classOfService() = mClassOfService;
+  openArgs.redirectionLimit() = mRedirectionLimit;
+  openArgs.allowSTS() = LoadAllowSTS();
+  openArgs.thirdPartyFlags() = LoadThirdPartyFlags();
+  openArgs.resumeAt() = mSendResumeAt;
+  openArgs.startPos() = mStartPos;
+  openArgs.entityID() = mEntityID;
+  openArgs.allowSpdy() = LoadAllowSpdy();
+  openArgs.allowHttp3() = LoadAllowHttp3();
+  openArgs.allowAltSvc() = LoadAllowAltSvc();
+  openArgs.beConservative() = LoadBeConservative();
+  openArgs.bypassProxy() = BypassProxy();
+  openArgs.tlsFlags() = mTlsFlags;
+  openArgs.initialRwin() = mInitialRwin;
+
+  openArgs.cacheKey() = mCacheKey;
+
+  openArgs.blockAuthPrompt() = LoadBlockAuthPrompt();
+
+  openArgs.allowStaleCacheContent() = LoadAllowStaleCacheContent();
+  openArgs.preferCacheLoadOverBypass() = LoadPreferCacheLoadOverBypass();
+
+  openArgs.contentTypeHint() = mContentTypeHint;
+
+  rv = mozilla::ipc::LoadInfoToLoadInfoArgs(mLoadInfo, &openArgs.loadInfo());
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  EnsureRequestContextID();
+  openArgs.requestContextID() = mRequestContextID;
+
+  openArgs.requestMode() = mRequestMode;
+  openArgs.redirectMode() = mRedirectMode;
+
+  openArgs.channelId() = mChannelId;
+
+  openArgs.integrityMetadata() = mIntegrityMetadata;
+
+  openArgs.contentWindowId() = contentWindowId;
+  openArgs.browserId() = mBrowserId;
+
+  LOG(("HttpChannelChild::ContinueAsyncOpen this=%p gid=%" PRIu64
+       " browser id=%" PRIx64,
+       this, mChannelId, mBrowserId));
+
+  if (browserChild && !browserChild->IPCOpen()) {
+    return NS_ERROR_FAILURE;
+  }
+
+  ContentChild* cc = static_cast<ContentChild*>(gNeckoChild->Manager());
+  if (cc->IsShuttingDown()) {
+    return NS_ERROR_FAILURE;
+  }
+
+  openArgs.launchServiceWorkerStart() = mLaunchServiceWorkerStart;
+  openArgs.launchServiceWorkerEnd() = mLaunchServiceWorkerEnd;
+  openArgs.dispatchFetchEventStart() = mDispatchFetchEventStart;
+  openArgs.dispatchFetchEventEnd() = mDispatchFetchEventEnd;
+  openArgs.handleFetchEventStart() = mHandleFetchEventStart;
+  openArgs.handleFetchEventEnd() = mHandleFetchEventEnd;
+
+  openArgs.forceMainDocumentChannel() = LoadForceMainDocumentChannel();
+
+  openArgs.navigationStartTimeStamp() = navigationStartTimeStamp;
+  openArgs.earlyHintPreloaderId() = mEarlyHintPreloaderId;
+
+  openArgs.classicScriptHintCharset() = mClassicScriptHintCharset;
+
+  RefPtr<Document> doc;
+  mLoadInfo->GetLoadingDocument(getter_AddRefs(doc));
+
+  if (doc) {
+    nsAutoString documentCharacterSet;
+    doc->GetCharacterSet(documentCharacterSet);
+    openArgs.documentCharacterSet() = documentCharacterSet;
+  }
+
+  // This must happen before the constructor message is sent. Otherwise messages
+  // from the parent could arrive quickly and be delivered to the wrong event
+  // target.
+  SetEventTarget();
+
+  if (!gNeckoChild->SendPHttpChannelConstructor(
+          this, browserChild, IPC::SerializedLoadContext(this), openArgs)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  {
+    MutexAutoLock lock(mBgChildMutex);
+
+    MOZ_RELEASE_ASSERT(gSocketTransportService);
+
+    // Service worker might use the same HttpChannelChild to do async open
+    // twice. Need to disconnect with previous background channel before
+    // creating the new one, to prevent receiving further notification
+    // from it.
+    if (mBgChild) {
+      RefPtr<HttpBackgroundChannelChild> prevBgChild = std::move(mBgChild);
+      gSocketTransportService->Dispatch(
+          NewRunnableMethod("HttpBackgroundChannelChild::OnChannelClosed",
+                            prevBgChild,
+                            &HttpBackgroundChannelChild::OnChannelClosed),
+          NS_DISPATCH_NORMAL);
+    }
+
+    MOZ_ASSERT(!mBgInitFailCallback);
+
+    mBgInitFailCallback = NewRunnableMethod<nsresult>(
+        "HttpChannelChild::FailedAsyncOpen", this,
+        &HttpChannelChild::FailedAsyncOpen, NS_ERROR_FAILURE);
+
+    RefPtr<HttpBackgroundChannelChild> bgChild =
+        new HttpBackgroundChannelChild();
+
+    RefPtr<HttpChannelChild> self = this;
+    nsresult rv = gSocketTransportService->Dispatch(
+        NewRunnableMethod<RefPtr<HttpChannelChild>>(
+            "HttpBackgroundChannelChild::Init", bgChild,
+            &HttpBackgroundChannelChild::Init, self),
+        NS_DISPATCH_NORMAL);
+
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    mBgChild = std::move(bgChild);
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+    mEverHadBgChildAtAsyncOpen = true;
+#endif
+  }
+
+  MaybeConnectToSocketProcess();
+
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsIHttpChannel
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+HttpChannelChild::SetRequestHeader(const nsACString& aHeader,
+                                   const nsACString& aValue, bool aMerge) {
+  LOG(("HttpChannelChild::SetRequestHeader [this=%p]\n", this));
+  nsresult rv = HttpBaseChannel::SetRequestHeader(aHeader, aValue, aMerge);
+  if (NS_FAILED(rv)) return rv;
+
+  RequestHeaderTuple* tuple = mClientSetRequestHeaders.AppendElement();
+  if (!tuple) return NS_ERROR_OUT_OF_MEMORY;
+
+  tuple->mHeader = aHeader;
+  tuple->mValue = aValue;
+  tuple->mMerge = aMerge;
+  tuple->mEmpty = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::SetEmptyRequestHeader(const nsACString& aHeader) {
+  LOG(("HttpChannelChild::SetEmptyRequestHeader [this=%p]\n", this));
+  nsresult rv = HttpBaseChannel::SetEmptyRequestHeader(aHeader);
+  if (NS_FAILED(rv)) return rv;
+
+  RequestHeaderTuple* tuple = mClientSetRequestHeaders.AppendElement();
+  if (!tuple) return NS_ERROR_OUT_OF_MEMORY;
+
+  tuple->mHeader = aHeader;
+  tuple->mMerge = false;
+  tuple->mEmpty = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::RedirectTo(nsIURI* newURI) {
+  // disabled until/unless addons run in child or something else needs this
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::UpgradeToSecure() {
+  // disabled until/unless addons run in child or something else needs this
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::GetProtocolVersion(nsACString& aProtocolVersion) {
+  aProtocolVersion = mProtocolVersion;
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsIHttpChannelInternal
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+HttpChannelChild::GetIsAuthChannel(bool* aIsAuthChannel) { DROP_DEAD(); }
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsICacheInfoChannel
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+HttpChannelChild::GetCacheTokenFetchCount(uint32_t* _retval) {
+  NS_ENSURE_ARG_POINTER(_retval);
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!mCacheEntryAvailable && !mAltDataCacheEntryAvailable) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  *_retval = mCacheFetchCount;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::GetCacheTokenExpirationTime(uint32_t* _retval) {
+  NS_ENSURE_ARG_POINTER(_retval);
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!mCacheEntryAvailable) return NS_ERROR_NOT_AVAILABLE;
+
+  *_retval = mCacheExpirationTime;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::IsFromCache(bool* value) {
+  if (!LoadIsPending()) return NS_ERROR_NOT_AVAILABLE;
+
+  *value = mIsFromCache;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::GetCacheEntryId(uint64_t* aCacheEntryId) {
+  bool fromCache = false;
+  if (NS_FAILED(IsFromCache(&fromCache)) || !fromCache ||
+      !mCacheEntryAvailable) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  *aCacheEntryId = mCacheEntryId;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::IsRacing(bool* aIsRacing) {
+  if (!LoadAfterOnStartRequestBegun()) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  *aIsRacing = mIsRacing;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::GetCacheKey(uint32_t* cacheKey) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  *cacheKey = mCacheKey;
+  return NS_OK;
+}
+NS_IMETHODIMP
+HttpChannelChild::SetCacheKey(uint32_t cacheKey) {
+  ENSURE_CALLED_BEFORE_ASYNC_OPEN();
+
+  mCacheKey = cacheKey;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::SetAllowStaleCacheContent(bool aAllowStaleCacheContent) {
+  StoreAllowStaleCacheContent(aAllowStaleCacheContent);
+  return NS_OK;
+}
+NS_IMETHODIMP
+HttpChannelChild::GetAllowStaleCacheContent(bool* aAllowStaleCacheContent) {
+  NS_ENSURE_ARG(aAllowStaleCacheContent);
+  *aAllowStaleCacheContent = LoadAllowStaleCacheContent();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::SetForceValidateCacheContent(
+    bool aForceValidateCacheContent) {
+  StoreForceValidateCacheContent(aForceValidateCacheContent);
+  return NS_OK;
+}
+NS_IMETHODIMP
+HttpChannelChild::GetForceValidateCacheContent(
+    bool* aForceValidateCacheContent) {
+  NS_ENSURE_ARG(aForceValidateCacheContent);
+  *aForceValidateCacheContent = LoadForceValidateCacheContent();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::SetPreferCacheLoadOverBypass(
+    bool aPreferCacheLoadOverBypass) {
+  StorePreferCacheLoadOverBypass(aPreferCacheLoadOverBypass);
+  return NS_OK;
+}
+NS_IMETHODIMP
+HttpChannelChild::GetPreferCacheLoadOverBypass(
+    bool* aPreferCacheLoadOverBypass) {
+  NS_ENSURE_ARG(aPreferCacheLoadOverBypass);
+  *aPreferCacheLoadOverBypass = LoadPreferCacheLoadOverBypass();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::PreferAlternativeDataType(
+    const nsACString& aType, const nsACString& aContentType,
+    PreferredAlternativeDataDeliveryType aDeliverAltData) {
+  ENSURE_CALLED_BEFORE_ASYNC_OPEN();
+
+  mPreferredCachedAltDataTypes.AppendElement(PreferredAlternativeDataTypeParams(
+      nsCString(aType), nsCString(aContentType), aDeliverAltData));
+  return NS_OK;
+}
+
+const nsTArray<PreferredAlternativeDataTypeParams>&
+HttpChannelChild::PreferredAlternativeDataTypes() {
+  return mPreferredCachedAltDataTypes;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::GetAlternativeDataType(nsACString& aType) {
+  // Must be called during or after OnStartRequest
+  if (!LoadAfterOnStartRequestBegun()) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  aType = mAvailableCachedAltDataType;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::OpenAlternativeOutputStream(const nsACString& aType,
+                                              int64_t aPredictedSize,
+                                              nsIAsyncOutputStream** _retval) {
+  MOZ_ASSERT(NS_IsMainThread(), "Main thread only");
+
+  if (!CanSend()) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  if (static_cast<ContentChild*>(gNeckoChild->Manager())->IsShuttingDown()) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  nsCOMPtr<nsISerialEventTarget> neckoTarget = GetNeckoTarget();
+  MOZ_ASSERT(neckoTarget);
+
+  RefPtr<AltDataOutputStreamChild> stream = new AltDataOutputStreamChild();
+  stream->AddIPDLReference();
+
+  if (!gNeckoChild->SendPAltDataOutputStreamConstructor(
+          stream, nsCString(aType), aPredictedSize, WrapNotNull(this))) {
+    return NS_ERROR_FAILURE;
+  }
+
+  stream.forget(_retval);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::GetOriginalInputStream(nsIInputStreamReceiver* aReceiver) {
+  if (aReceiver == nullptr) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  if (!CanSend()) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  mOriginalInputStreamReceiver = aReceiver;
+  Unused << SendOpenOriginalCacheInputStream();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::GetAlternativeDataInputStream(nsIInputStream** aInputStream) {
+  NS_ENSURE_ARG_POINTER(aInputStream);
+
+  nsCOMPtr<nsIInputStream> is = mAltDataInputStream;
+  is.forget(aInputStream);
+
+  return NS_OK;
+}
+
+mozilla::ipc::IPCResult HttpChannelChild::RecvOriginalCacheInputStreamAvailable(
+    const Maybe<IPCStream>& aStream) {
+  nsCOMPtr<nsIInputStream> stream = DeserializeIPCStream(aStream);
+  nsCOMPtr<nsIInputStreamReceiver> receiver;
+  receiver.swap(mOriginalInputStreamReceiver);
+  if (receiver) {
+    receiver->OnInputStreamReady(stream);
+  }
+
+  return IPC_OK();
+}
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsIResumableChannel
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+HttpChannelChild::ResumeAt(uint64_t startPos, const nsACString& entityID) {
+  LOG(("HttpChannelChild::ResumeAt [this=%p]\n", this));
+  ENSURE_CALLED_BEFORE_CONNECT();
+  mStartPos = startPos;
+  mEntityID = entityID;
+  mSendResumeAt = true;
+  return NS_OK;
+}
+
+// GetEntityID is shared in HttpBaseChannel
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsISupportsPriority
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+HttpChannelChild::SetPriority(int32_t aPriority) {
+  LOG(("HttpChannelChild::SetPriority %p p=%d", this, aPriority));
+  int16_t newValue = clamped<int32_t>(aPriority, INT16_MIN, INT16_MAX);
+  if (mPriority == newValue) return NS_OK;
+  mPriority = newValue;
+  if (RemoteChannelExists()) SendSetPriority(mPriority);
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsIClassOfService
+//-----------------------------------------------------------------------------
+NS_IMETHODIMP
+HttpChannelChild::SetClassFlags(uint32_t inFlags) {
+  if (mClassOfService.Flags() == inFlags) {
+    return NS_OK;
+  }
+
+  mClassOfService.SetFlags(inFlags);
+
+  LOG(("HttpChannelChild %p ClassOfService flags=%lu inc=%d", this,
+       mClassOfService.Flags(), mClassOfService.Incremental()));
+
+  if (RemoteChannelExists()) {
+    SendSetClassOfService(mClassOfService);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::AddClassFlags(uint32_t inFlags) {
+  mClassOfService.SetFlags(inFlags | mClassOfService.Flags());
+
+  LOG(("HttpChannelChild %p ClassOfService flags=%lu inc=%d", this,
+       mClassOfService.Flags(), mClassOfService.Incremental()));
+
+  if (RemoteChannelExists()) {
+    SendSetClassOfService(mClassOfService);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::ClearClassFlags(uint32_t inFlags) {
+  mClassOfService.SetFlags(~inFlags & mClassOfService.Flags());
+
+  LOG(("HttpChannelChild %p ClassOfService=%lu", this,
+       mClassOfService.Flags()));
+
+  if (RemoteChannelExists()) {
+    SendSetClassOfService(mClassOfService);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::SetClassOfService(ClassOfService inCos) {
+  mClassOfService = inCos;
+  LOG(("HttpChannelChild %p ClassOfService flags=%lu inc=%d", this,
+       mClassOfService.Flags(), mClassOfService.Incremental()));
+  if (RemoteChannelExists()) {
+    SendSetClassOfService(mClassOfService);
+  }
+  return NS_OK;
+}
+NS_IMETHODIMP
+HttpChannelChild::SetIncremental(bool inIncremental) {
+  mClassOfService.SetIncremental(inIncremental);
+  LOG(("HttpChannelChild %p ClassOfService flags=%lu inc=%d", this,
+       mClassOfService.Flags(), mClassOfService.Incremental()));
+  if (RemoteChannelExists()) {
+    SendSetClassOfService(mClassOfService);
+  }
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsIProxiedChannel
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+HttpChannelChild::GetProxyInfo(nsIProxyInfo** aProxyInfo) { DROP_DEAD(); }
+
+NS_IMETHODIMP HttpChannelChild::GetHttpProxyConnectResponseCode(
+    int32_t* aResponseCode) {
+  DROP_DEAD();
+}
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsIHttpChannelChild
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP HttpChannelChild::AddCookiesToRequest() {
+  HttpBaseChannel::AddCookiesToRequest();
+  return NS_OK;
+}
+
+NS_IMETHODIMP HttpChannelChild::GetClientSetRequestHeaders(
+    RequestHeaderTuples** aRequestHeaders) {
+  *aRequestHeaders = &mClientSetRequestHeaders;
+  return NS_OK;
+}
+
+void HttpChannelChild::GetClientSetCorsPreflightParameters(
+    Maybe<CorsPreflightArgs>& aArgs) {
+  if (LoadRequireCORSPreflight()) {
+    CorsPreflightArgs args;
+    args.unsafeHeaders() = mUnsafeHeaders.Clone();
+    aArgs.emplace(args);
+  } else {
+    aArgs = Nothing();
+  }
+}
+
+NS_IMETHODIMP
+HttpChannelChild::RemoveCorsPreflightCacheEntry(
+    nsIURI* aURI, nsIPrincipal* aPrincipal,
+    const OriginAttributes& aOriginAttributes) {
+  PrincipalInfo principalInfo;
+  MOZ_ASSERT(aURI, "aURI should not be null");
+  nsresult rv = PrincipalToPrincipalInfo(aPrincipal, &principalInfo);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+  bool result = false;
+  // Be careful to not attempt to send a message to the parent after the
+  // actor has been destroyed.
+  if (CanSend()) {
+    result = SendRemoveCorsPreflightCacheEntry(aURI, principalInfo,
+                                               aOriginAttributes);
+  }
+  return result ? NS_OK : NS_ERROR_FAILURE;
+}
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsIMuliPartChannel
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+HttpChannelChild::GetBaseChannel(nsIChannel** aBaseChannel) {
+  if (!mMultiPartID) {
+    MOZ_ASSERT(false, "Not a multipart channel");
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  nsCOMPtr<nsIChannel> channel = this;
+  channel.forget(aBaseChannel);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::GetPartID(uint32_t* aPartID) {
+  if (!mMultiPartID) {
+    MOZ_ASSERT(false, "Not a multipart channel");
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  *aPartID = *mMultiPartID;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::GetIsFirstPart(bool* aIsFirstPart) {
+  if (!mMultiPartID) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  *aIsFirstPart = mIsFirstPartOfMultiPart;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::GetIsLastPart(bool* aIsLastPart) {
+  if (!mMultiPartID) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  *aIsLastPart = mIsLastPartOfMultiPart;
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// HttpChannelChild::nsIThreadRetargetableRequest
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+HttpChannelChild::RetargetDeliveryTo(nsISerialEventTarget* aNewTarget) {
+  LOG(("HttpChannelChild::RetargetDeliveryTo [this=%p, aNewTarget=%p]", this,
+       aNewTarget));
+
+  MOZ_ASSERT(NS_IsMainThread(), "Should be called on main thread only");
+  MOZ_ASSERT(aNewTarget);
+
+  NS_ENSURE_ARG(aNewTarget);
+  if (aNewTarget->IsOnCurrentThread()) {
+    NS_WARNING("Retargeting delivery to same thread");
+    mOMTResult = LABELS_HTTP_CHILD_OMT_STATS::successMainThread;
+    return NS_OK;
+  }
+
+  if (mMultiPartID) {
+    // TODO: Maybe add a new label for this? Maybe it doesn't
+    // matter though, since we also blocked QI, so we shouldn't
+    // ever get here.
+    mOMTResult = LABELS_HTTP_CHILD_OMT_STATS::failListener;
+    return NS_ERROR_NO_INTERFACE;
+  }
+
+  // Ensure that |mListener| and any subsequent listeners can be retargeted
+  // to another thread.
+  nsresult rv = NS_OK;
+  nsCOMPtr<nsIThreadRetargetableStreamListener> retargetableListener =
+      do_QueryInterface(mListener, &rv);
+  if (!retargetableListener || NS_FAILED(rv)) {
+    NS_WARNING("Listener is not retargetable");
+    mOMTResult = LABELS_HTTP_CHILD_OMT_STATS::failListener;
+    return NS_ERROR_NO_INTERFACE;
+  }
+
+  rv = retargetableListener->CheckListenerChain();
+  if (NS_FAILED(rv)) {
+    NS_WARNING("Subsequent listeners are not retargetable");
+    mOMTResult = LABELS_HTTP_CHILD_OMT_STATS::failListenerChain;
+    return rv;
+  }
+
+  {
+    MutexAutoLock lock(mEventTargetMutex);
+    MOZ_ASSERT(!mODATarget);
+    mODATarget = aNewTarget;
+  }
+
+  mOMTResult = LABELS_HTTP_CHILD_OMT_STATS::success;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HttpChannelChild::GetDeliveryTarget(nsISerialEventTarget** aEventTarget) {
+  MutexAutoLock lock(mEventTargetMutex);
+
+  nsCOMPtr<nsISerialEventTarget> target = mODATarget;
+  if (!mODATarget) {
+    target = GetCurrentSerialEventTarget();
+  }
+  target.forget(aEventTarget);
+  return NS_OK;
+}
+
+void HttpChannelChild::TrySendDeletingChannel() {
+  AUTO_PROFILER_LABEL("HttpChannelChild::TrySendDeletingChannel", NETWORK);
+  if (!mDeletingChannelSent.compareExchange(false, true)) {
+    // SendDeletingChannel is already sent.
+    return;
+  }
+
+  if (NS_IsMainThread()) {
+    if (NS_WARN_IF(!CanSend())) {
+      // IPC actor is destroyed already, do not send more messages.
+      return;
+    }
+
+    Unused << PHttpChannelChild::SendDeletingChannel();
+    return;
+  }
+
+  nsCOMPtr<nsISerialEventTarget> neckoTarget = GetNeckoTarget();
+  MOZ_ASSERT(neckoTarget);
+
+  DebugOnly<nsresult> rv = neckoTarget->Dispatch(
+      NewNonOwningRunnableMethod(
+          "net::HttpChannelChild::TrySendDeletingChannel", this,
+          &HttpChannelChild::TrySendDeletingChannel),
+      NS_DISPATCH_NORMAL);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+}
+
+nsresult HttpChannelChild::AsyncCallImpl(
+    void (HttpChannelChild::*funcPtr)(),
+    nsRunnableMethod<HttpChannelChild>** retval) {
+  nsresult rv;
+
+  RefPtr<nsRunnableMethod<HttpChannelChild>> event =
+      NewRunnableMethod("net::HttpChannelChild::AsyncCall", this, funcPtr);
+  nsCOMPtr<nsISerialEventTarget> neckoTarget = GetNeckoTarget();
+  MOZ_ASSERT(neckoTarget);
+
+  rv = neckoTarget->Dispatch(event, NS_DISPATCH_NORMAL);
+
+  if (NS_SUCCEEDED(rv) && retval) {
+    *retval = event;
+  }
+
+  return rv;
+}
+
+nsresult HttpChannelChild::SetReferrerHeader(const nsACString& aReferrer,
+                                             bool aRespectBeforeConnect) {
+  // Normally this would be ENSURE_CALLED_BEFORE_CONNECT, but since the
+  // "connect" is done in the main process, and LoadRequestObserversCalled() is
+  // never set in the ChannelChild, before connect basically means before
+  // asyncOpen.
+  if (aRespectBeforeConnect) {
+    ENSURE_CALLED_BEFORE_ASYNC_OPEN();
+  }
+
+  // remove old referrer if any
+  mClientSetRequestHeaders.RemoveElementsBy(
+      [](const auto& header) { return "Referer"_ns.Equals(header.mHeader); });
+
+  return HttpBaseChannel::SetReferrerHeader(aReferrer, aRespectBeforeConnect);
+}
+
+void HttpChannelChild::CancelOnMainThread(nsresult aRv,
+                                          const nsACString& aReason) {
+  LOG(("HttpChannelChild::CancelOnMainThread [this=%p]", this));
+
+  if (NS_IsMainThread()) {
+    CancelWithReason(aRv, aReason);
+    return;
+  }
+
+  mEventQ->Suspend();
+  // Cancel is expected to preempt any other channel events, thus we put this
+  // event in the front of mEventQ to make sure nsIStreamListener not receiving
+  // any ODA/OnStopRequest callbacks.
+  nsCString reason(aReason);
+  mEventQ->PrependEvent(MakeUnique<NeckoTargetChannelFunctionEvent>(
+      this, [self = UnsafePtr<HttpChannelChild>(this), aRv, reason]() {
+        self->CancelWithReason(aRv, reason);
+      }));
+  mEventQ->Resume();
+}
+
+mozilla::ipc::IPCResult HttpChannelChild::RecvSetPriority(
+    const int16_t& aPriority) {
+  mPriority = aPriority;
+  return IPC_OK();
+}
+
+// We don't have a copyable Endpoint and NeckoTargetChannelFunctionEvent takes
+// std::function<void()>.  It's not possible to avoid the copy from the type of
+// lambda to std::function, so does the capture list. Hence, we're forced to
+// use the old-fashioned channel event inheritance.
+class AttachStreamFilterEvent : public ChannelEvent {
+ public:
+  AttachStreamFilterEvent(HttpChannelChild* aChild,
+                          already_AddRefed<nsIEventTarget> aTarget,
+                          Endpoint<extensions::PStreamFilterParent>&& aEndpoint)
+      : mChild(aChild), mTarget(aTarget), mEndpoint(std::move(aEndpoint)) {}
+
+  already_AddRefed<nsIEventTarget> GetEventTarget() override {
+    nsCOMPtr<nsIEventTarget> target = mTarget;
+    return target.forget();
+  }
+
+  void Run() override {
+    extensions::StreamFilterParent::Attach(mChild, std::move(mEndpoint));
+  }
+
+ private:
+  HttpChannelChild* mChild;
+  nsCOMPtr<nsIEventTarget> mTarget;
+  Endpoint<extensions::PStreamFilterParent> mEndpoint;
+};
+
+void HttpChannelChild::RegisterStreamFilter(
+    RefPtr<extensions::StreamFilterParent>& aStreamFilter) {
+  MOZ_ASSERT(NS_IsMainThread());
+  mStreamFilters.AppendElement(aStreamFilter);
+}
+
+void HttpChannelChild::ProcessAttachStreamFilter(
+    Endpoint<extensions::PStreamFilterParent>&& aEndpoint) {
+  LOG(("HttpChannelChild::ProcessAttachStreamFilter [this=%p]\n", this));
+  MOZ_ASSERT(OnSocketThread());
+
+  mEventQ->RunOrEnqueue(new AttachStreamFilterEvent(this, GetNeckoTarget(),
+                                                    std::move(aEndpoint)));
+}
+
+void HttpChannelChild::OnDetachStreamFilters() {
+  LOG(("HttpChannelChild::OnDetachStreamFilters [this=%p]\n", this));
+  MOZ_ASSERT(NS_IsMainThread());
+  for (auto& StreamFilter : mStreamFilters) {
+    StreamFilter->Disconnect("ServiceWorker fallback redirection"_ns);
+  }
+  mStreamFilters.Clear();
+}
+
+void HttpChannelChild::ProcessDetachStreamFilters() {
+  LOG(("HttpChannelChild::ProcessDetachStreamFilter [this=%p]\n", this));
+  MOZ_ASSERT(OnSocketThread());
+
+  mEventQ->RunOrEnqueue(new NeckoTargetChannelFunctionEvent(
+      this, [self = UnsafePtr<HttpChannelChild>(this)]() {
+        self->OnDetachStreamFilters();
+      }));
+}
+
+void HttpChannelChild::ActorDestroy(ActorDestroyReason aWhy) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+  mActorDestroyReason.emplace(aWhy);
+#endif
+
+  // OnStartRequest might be dropped if IPDL is destroyed abnormally
+  // and BackgroundChild might have pending IPC messages.
+  // Clean up BackgroundChild at this time to prevent memleak.
+  if (aWhy != Deletion) {
+    // Make sure all the messages are processed.
+    AutoEventEnqueuer ensureSerialDispatch(mEventQ);
+
+    mStatus = NS_ERROR_DOCSHELL_DYING;
+    HandleAsyncAbort();
+
+    // Cleanup the background channel before we resume the eventQ so we don't
+    // get any other events.
+    CleanupBackgroundChannel();
+
+    mIPCActorDeleted = true;
+    mCanceled = true;
+  }
+}
+
+mozilla::ipc::IPCResult HttpChannelChild::RecvLogBlockedCORSRequest(
+    const nsAString& aMessage, const nsACString& aCategory,
+    const bool& aIsWarning) {
+  Unused << LogBlockedCORSRequest(aMessage, aCategory, aIsWarning);
+  return IPC_OK();
+}
+
+NS_IMETHODIMP
+HttpChannelChild::LogBlockedCORSRequest(const nsAString& aMessage,
+                                        const nsACString& aCategory,
+                                        bool aIsWarning) {
+  uint64_t innerWindowID = mLoadInfo->GetInnerWindowID();
+  bool privateBrowsing = !!mLoadInfo->GetOriginAttributes().mPrivateBrowsingId;
+  bool fromChromeContext =
+      mLoadInfo->TriggeringPrincipal()->IsSystemPrincipal();
+  nsCORSListenerProxy::LogBlockedCORSRequest(innerWindowID, privateBrowsing,
+                                             fromChromeContext, aMessage,
+                                             aCategory, aIsWarning);
+  return NS_OK;
+}
+
+mozilla::ipc::IPCResult HttpChannelChild::RecvLogMimeTypeMismatch(
+    const nsACString& aMessageName, const bool& aWarning, const nsAString& aURL,
+    const nsAString& aContentType) {
+  Unused << LogMimeTypeMismatch(aMessageName, aWarning, aURL, aContentType);
+  return IPC_OK();
+}
+
+NS_IMETHODIMP
+HttpChannelChild::LogMimeTypeMismatch(const nsACString& aMessageName,
+                                      bool aWarning, const nsAString& aURL,
+                                      const nsAString& aContentType) {
+  RefPtr<Document> doc;
+  mLoadInfo->GetLoadingDocument(getter_AddRefs(doc));
+
+  AutoTArray<nsString, 2> params;
+  params.AppendElement(aURL);
+  params.AppendElement(aContentType);
+  nsContentUtils::ReportToConsole(
+      aWarning ? nsIScriptError::warningFlag : nsIScriptError::errorFlag,
+      "MIMEMISMATCH"_ns, doc, nsContentUtils::eSECURITY_PROPERTIES,
+      nsCString(aMessageName).get(), params);
+  return NS_OK;
+}
+
+nsresult HttpChannelChild::MaybeLogCOEPError(nsresult aStatus) {
+  if (aStatus == NS_ERROR_DOM_CORP_FAILED) {
+    RefPtr<Document> doc;
+    mLoadInfo->GetLoadingDocument(getter_AddRefs(doc));
+
+    nsAutoCString url;
+    mURI->GetSpec(url);
+
+    AutoTArray<nsString, 2> params;
+    params.AppendElement(NS_ConvertUTF8toUTF16(url));
+    // The MDN URL intentionally ends with a # so the webconsole linkification
+    // doesn't ignore the final ) of the URL
+    params.AppendElement(
+        u"https://developer.mozilla.org/docs/Web/HTTP/Cross-Origin_Resource_Policy_(CORP)#"_ns);
+    nsContentUtils::ReportToConsole(nsIScriptError::errorFlag, "COEP"_ns, doc,
+                                    nsContentUtils::eNECKO_PROPERTIES,
+                                    "CORPBlocked", params);
+  }
+
+  return NS_OK;
+}
+
+nsresult HttpChannelChild::CrossProcessRedirectFinished(nsresult aStatus) {
+  if (!CanSend()) {
+    return NS_BINDING_FAILED;
+  }
+
+  if (!mCanceled && NS_SUCCEEDED(mStatus)) {
+    mStatus = aStatus;
+  }
+
+  return mStatus;
+}
+
+void HttpChannelChild::DoDiagnosticAssertWhenOnStopNotCalledOnDestroy() {
+#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
+  mDoDiagnosticAssertWhenOnStopNotCalledOnDestroy = true;
+#endif
+}
+
+void HttpChannelChild::MaybeConnectToSocketProcess() {
+  if (!nsIOService::UseSocketProcess()) {
+    return;
+  }
+
+  if (!StaticPrefs::network_send_ODA_to_content_directly()) {
+    return;
+  }
+
+  RefPtr<HttpBackgroundChannelChild> bgChild;
+  {
+    MutexAutoLock lock(mBgChildMutex);
+    bgChild = mBgChild;
+  }
+  SocketProcessBridgeChild::GetSocketProcessBridge()->Then(
+      GetCurrentSerialEventTarget(), __func__,
+      [bgChild]() {
+        gSocketTransportService->Dispatch(
+            NewRunnableMethod("HttpBackgroundChannelChild::CreateDataBridge",
+                              bgChild,
+                              &HttpBackgroundChannelChild::CreateDataBridge),
+            NS_DISPATCH_NORMAL);
+      },
+      []() { NS_WARNING("Failed to create SocketProcessBridgeChild"); });
+}
+
+NS_IMETHODIMP
+HttpChannelChild::SetEarlyHintObserver(nsIEarlyHintObserver* aObserver) {
+  return NS_OK;
+}
+
+NS_IMETHODIMP HttpChannelChild::SetWebTransportSessionEventListener(
+    WebTransportSessionEventListener* aListener) {
+  return NS_OK;
+}
+
+}  // namespace mozilla::net