Adding upstream version 124.0.1.upstream/124.0.1

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

1 files changed, 2609 insertions, 0 deletions

diff --git a/netwerk/protocol/http/nsHttpConnection.cpp b/netwerk/protocol/http/nsHttpConnection.cpp
new file mode 100644
index 0000000000..023c06f3f3
--- /dev/null
+++ b/netwerk/protocol/http/nsHttpConnection.cpp
@@ -0,0 +1,2609 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=4 sw=2 sts=2 et cin: */
+/* 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"
+
+// Log on level :5, instead of default :4.
+#undef LOG
+#define LOG(args) LOG5(args)
+#undef LOG_ENABLED
+#define LOG_ENABLED() LOG5_ENABLED()
+
+#include "ASpdySession.h"
+#include "NSSErrorsService.h"
+#include "TLSTransportLayer.h"
+#include "mozilla/ChaosMode.h"
+#include "mozilla/StaticPrefs_network.h"
+#include "mozilla/Telemetry.h"
+#include "mozpkix/pkixnss.h"
+#include "nsCRT.h"
+#include "nsHttpConnection.h"
+#include "nsHttpHandler.h"
+#include "nsHttpRequestHead.h"
+#include "nsHttpResponseHead.h"
+#include "nsIClassOfService.h"
+#include "nsIOService.h"
+#include "nsISocketTransport.h"
+#include "nsISupportsPriority.h"
+#include "nsITLSSocketControl.h"
+#include "nsITransportSecurityInfo.h"
+#include "nsPreloadedStream.h"
+#include "nsProxyRelease.h"
+#include "nsQueryObject.h"
+#include "nsSocketTransport2.h"
+#include "nsSocketTransportService2.h"
+#include "nsStringStream.h"
+#include "sslerr.h"
+#include "sslt.h"
+
+namespace mozilla::net {
+
+enum TlsHandshakeResult : uint32_t {
+  EchConfigSuccessful = 0,
+  EchConfigFailed,
+  NoEchConfigSuccessful,
+  NoEchConfigFailed,
+};
+
+//-----------------------------------------------------------------------------
+// nsHttpConnection <public>
+//-----------------------------------------------------------------------------
+
+nsHttpConnection::nsHttpConnection() : mHttpHandler(gHttpHandler) {
+  LOG(("Creating nsHttpConnection @%p\n", this));
+
+  // the default timeout is for when this connection has not yet processed a
+  // transaction
+  static const PRIntervalTime k5Sec = PR_SecondsToInterval(5);
+  mIdleTimeout = (k5Sec < gHttpHandler->IdleTimeout())
+                     ? k5Sec
+                     : gHttpHandler->IdleTimeout();
+
+  mThroughCaptivePortal = gHttpHandler->GetThroughCaptivePortal();
+}
+
+nsHttpConnection::~nsHttpConnection() {
+  LOG(("Destroying nsHttpConnection @%p\n", this));
+
+  if (!mEverUsedSpdy) {
+    LOG(("nsHttpConnection %p performed %d HTTP/1.x transactions\n", this,
+         mHttp1xTransactionCount));
+    Telemetry::Accumulate(Telemetry::HTTP_REQUEST_PER_CONN,
+                          mHttp1xTransactionCount);
+    nsHttpConnectionInfo* ci = nullptr;
+    if (mTransaction) {
+      ci = mTransaction->ConnectionInfo();
+    }
+    if (!ci) {
+      ci = mConnInfo;
+    }
+
+    MOZ_ASSERT(ci);
+    if (ci->GetIsTrrServiceChannel()) {
+      Telemetry::Accumulate(Telemetry::DNS_TRR_REQUEST_PER_CONN,
+                            mHttp1xTransactionCount);
+    }
+  }
+
+  if (mTotalBytesRead) {
+    uint32_t totalKBRead = static_cast<uint32_t>(mTotalBytesRead >> 10);
+    LOG(("nsHttpConnection %p read %dkb on connection spdy=%d\n", this,
+         totalKBRead, mEverUsedSpdy));
+    Telemetry::Accumulate(mEverUsedSpdy ? Telemetry::SPDY_KBREAD_PER_CONN2
+                                        : Telemetry::HTTP_KBREAD_PER_CONN2,
+                          totalKBRead);
+  }
+
+  if (mThroughCaptivePortal) {
+    if (mTotalBytesRead || mTotalBytesWritten) {
+      auto total =
+          Clamp<uint32_t>((mTotalBytesRead >> 10) + (mTotalBytesWritten >> 10),
+                          0, std::numeric_limits<uint32_t>::max());
+      Telemetry::ScalarAdd(
+          Telemetry::ScalarID::NETWORKING_DATA_TRANSFERRED_CAPTIVE_PORTAL,
+          total);
+    }
+
+    Telemetry::ScalarAdd(
+        Telemetry::ScalarID::NETWORKING_HTTP_CONNECTIONS_CAPTIVE_PORTAL, 1);
+  }
+
+  if (mForceSendTimer) {
+    mForceSendTimer->Cancel();
+    mForceSendTimer = nullptr;
+  }
+
+  auto ReleaseSocketTransport =
+      [socketTransport(std::move(mSocketTransport))]() mutable {
+        socketTransport = nullptr;
+      };
+  if (OnSocketThread()) {
+    ReleaseSocketTransport();
+  } else {
+    gSocketTransportService->Dispatch(NS_NewRunnableFunction(
+        "nsHttpConnection::~nsHttpConnection", ReleaseSocketTransport));
+  }
+}
+
+nsresult nsHttpConnection::Init(
+    nsHttpConnectionInfo* info, uint16_t maxHangTime,
+    nsISocketTransport* transport, nsIAsyncInputStream* instream,
+    nsIAsyncOutputStream* outstream, bool connectedTransport, nsresult status,
+    nsIInterfaceRequestor* callbacks, PRIntervalTime rtt, bool forWebSocket) {
+  LOG1(("nsHttpConnection::Init this=%p sockettransport=%p forWebSocket=%d",
+        this, transport, forWebSocket));
+  NS_ENSURE_ARG_POINTER(info);
+  NS_ENSURE_TRUE(!mConnInfo, NS_ERROR_ALREADY_INITIALIZED);
+  MOZ_ASSERT(NS_SUCCEEDED(status) || !connectedTransport);
+
+  mConnectedTransport = connectedTransport;
+  mConnInfo = info;
+  MOZ_ASSERT(mConnInfo);
+
+  mLastWriteTime = mLastReadTime = PR_IntervalNow();
+  mRtt = rtt;
+  mMaxHangTime = PR_SecondsToInterval(maxHangTime);
+
+  mSocketTransport = transport;
+  mSocketIn = instream;
+  mSocketOut = outstream;
+  mForWebSocket = forWebSocket;
+
+  // See explanation for non-strictness of this operation in
+  // SetSecurityCallbacks.
+  mCallbacks = new nsMainThreadPtrHolder<nsIInterfaceRequestor>(
+      "nsHttpConnection::mCallbacks", callbacks, false);
+
+  mErrorBeforeConnect = status;
+  if (NS_SUCCEEDED(mErrorBeforeConnect)) {
+    mSocketTransport->SetEventSink(this, nullptr);
+    mSocketTransport->SetSecurityCallbacks(this);
+    ChangeConnectionState(ConnectionState::INITED);
+  } else {
+    SetCloseReason(ToCloseReason(mErrorBeforeConnect));
+  }
+
+  mTlsHandshaker = new TlsHandshaker(mConnInfo, this);
+  return NS_OK;
+}
+
+void nsHttpConnection::ChangeState(HttpConnectionState newState) {
+  LOG(("nsHttpConnection::ChangeState %d -> %d [this=%p]", mState, newState,
+       this));
+  mState = newState;
+}
+
+nsresult nsHttpConnection::TryTakeSubTransactions(
+    nsTArray<RefPtr<nsAHttpTransaction> >& list) {
+  nsresult rv = mTransaction->TakeSubTransactions(list);
+
+  if (rv == NS_ERROR_ALREADY_OPENED) {
+    // Has the interface for TakeSubTransactions() changed?
+    LOG(
+        ("TakeSubTransactions somehow called after "
+         "nsAHttpTransaction began processing\n"));
+    MOZ_ASSERT(false,
+               "TakeSubTransactions somehow called after "
+               "nsAHttpTransaction began processing");
+    mTransaction->Close(NS_ERROR_ABORT);
+    return rv;
+  }
+
+  if (NS_FAILED(rv) && rv != NS_ERROR_NOT_IMPLEMENTED) {
+    // Has the interface for TakeSubTransactions() changed?
+    LOG(("unexpected rv from nnsAHttpTransaction::TakeSubTransactions()"));
+    MOZ_ASSERT(false,
+               "unexpected result from "
+               "nsAHttpTransaction::TakeSubTransactions()");
+    mTransaction->Close(NS_ERROR_ABORT);
+    return rv;
+  }
+
+  return rv;
+}
+
+void nsHttpConnection::ResetTransaction(RefPtr<nsAHttpTransaction>&& trans) {
+  MOZ_ASSERT(trans);
+  mSpdySession->SetConnection(trans->Connection());
+  trans->SetConnection(nullptr);
+  trans->DoNotRemoveAltSvc();
+  trans->Close(NS_ERROR_NET_RESET);
+}
+
+nsresult nsHttpConnection::MoveTransactionsToSpdy(
+    nsresult status, nsTArray<RefPtr<nsAHttpTransaction> >& list) {
+  if (NS_FAILED(status)) {  // includes NS_ERROR_NOT_IMPLEMENTED
+    MOZ_ASSERT(list.IsEmpty(), "sub transaction list not empty");
+
+    // If this transaction is used to drive websocket, we reset it to put it in
+    // the pending queue. Once we know if the server supports websocket or not,
+    // the pending queue will be processed.
+    nsHttpTransaction* trans = mTransaction->QueryHttpTransaction();
+    if (trans && trans->IsWebsocketUpgrade()) {
+      LOG(("nsHttpConnection resetting transaction for websocket upgrade"));
+      // websocket upgrade needs NonSticky for transaction reset
+      mTransaction->MakeNonSticky();
+      ResetTransaction(std::move(mTransaction));
+      mTransaction = nullptr;
+      return NS_OK;
+    }
+
+    // This is ok - treat mTransaction as a single real request.
+    // Wrap the old http transaction into the new spdy session
+    // as the first stream.
+    LOG(
+        ("nsHttpConnection::MoveTransactionsToSpdy moves single transaction %p "
+         "into SpdySession %p\n",
+         mTransaction.get(), mSpdySession.get()));
+    nsresult rv = AddTransaction(mTransaction, mPriority);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  } else {
+    int32_t count = list.Length();
+
+    LOG(
+        ("nsHttpConnection::MoveTransactionsToSpdy moving transaction list "
+         "len=%d "
+         "into SpdySession %p\n",
+         count, mSpdySession.get()));
+
+    if (!count) {
+      mTransaction->Close(NS_ERROR_ABORT);
+      return NS_ERROR_ABORT;
+    }
+
+    for (int32_t index = 0; index < count; ++index) {
+      RefPtr<nsAHttpTransaction> transaction = list[index];
+      nsHttpTransaction* trans = transaction->QueryHttpTransaction();
+      if (trans && trans->IsWebsocketUpgrade()) {
+        LOG(("nsHttpConnection resetting a transaction for websocket upgrade"));
+        // websocket upgrade needs NonSticky for transaction reset
+        transaction->MakeNonSticky();
+        ResetTransaction(std::move(transaction));
+        transaction = nullptr;
+        continue;
+      }
+      nsresult rv = AddTransaction(list[index], mPriority);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+    }
+  }
+
+  return NS_OK;
+}
+
+void nsHttpConnection::Start0RTTSpdy(SpdyVersion spdyVersion) {
+  LOG(("nsHttpConnection::Start0RTTSpdy [this=%p]", this));
+
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+
+  mDid0RTTSpdy = true;
+  mUsingSpdyVersion = spdyVersion;
+  mEverUsedSpdy = true;
+  mSpdySession =
+      ASpdySession::NewSpdySession(spdyVersion, mSocketTransport, true);
+
+  if (mTransaction) {
+    nsTArray<RefPtr<nsAHttpTransaction> > list;
+    nsresult rv = TryTakeSubTransactions(list);
+    if (NS_FAILED(rv) && rv != NS_ERROR_NOT_IMPLEMENTED) {
+      LOG(
+          ("nsHttpConnection::Start0RTTSpdy [this=%p] failed taking "
+           "subtransactions rv=%" PRIx32,
+           this, static_cast<uint32_t>(rv)));
+      return;
+    }
+
+    rv = MoveTransactionsToSpdy(rv, list);
+    if (NS_FAILED(rv)) {
+      LOG(
+          ("nsHttpConnection::Start0RTTSpdy [this=%p] failed moving "
+           "transactions rv=%" PRIx32,
+           this, static_cast<uint32_t>(rv)));
+      return;
+    }
+  }
+
+  mTransaction = mSpdySession;
+}
+
+void nsHttpConnection::StartSpdy(nsITLSSocketControl* sslControl,
+                                 SpdyVersion spdyVersion) {
+  LOG(("nsHttpConnection::StartSpdy [this=%p, mDid0RTTSpdy=%d]\n", this,
+       mDid0RTTSpdy));
+
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+  MOZ_ASSERT(!mSpdySession || mDid0RTTSpdy);
+
+  mUsingSpdyVersion = spdyVersion;
+  mEverUsedSpdy = true;
+  if (sslControl) {
+    sslControl->SetDenyClientCert(true);
+  }
+
+  if (!mDid0RTTSpdy) {
+    mSpdySession =
+        ASpdySession::NewSpdySession(spdyVersion, mSocketTransport, false);
+  }
+
+  if (!mReportedSpdy) {
+    mReportedSpdy = true;
+    // See bug 1797729.
+    // It's possible that we already have a HTTP/3 connection that can be
+    // coleased with this connection. We should avoid coalescing with the
+    // existing HTTP/3 connection if the transaction doesn't allow to use
+    // HTTP/3.
+    gHttpHandler->ConnMgr()->ReportSpdyConnection(this, true,
+                                                  mTransactionDisallowHttp3);
+  }
+
+  // Setting the connection as reused allows some transactions that fail
+  // with NS_ERROR_NET_RESET to be restarted and SPDY uses that code
+  // to handle clean rejections (such as those that arrived after
+  // a server goaway was generated).
+  mIsReused = true;
+
+  // If mTransaction is a muxed object it might represent
+  // several requests. If so, we need to unpack that and
+  // pack them all into a new spdy session.
+
+  nsTArray<RefPtr<nsAHttpTransaction> > list;
+  nsresult status = NS_OK;
+  if (!mDid0RTTSpdy && mTransaction) {
+    status = TryTakeSubTransactions(list);
+
+    if (NS_FAILED(status) && status != NS_ERROR_NOT_IMPLEMENTED) {
+      return;
+    }
+  }
+
+  if (NeedSpdyTunnel()) {
+    LOG3(
+        ("nsHttpConnection::StartSpdy %p Connecting To a HTTP/2 "
+         "Proxy and Need Connect",
+         this));
+    SetTunnelSetupDone();
+  }
+
+  nsresult rv = NS_OK;
+  bool spdyProxy = mConnInfo->UsingHttpsProxy() && mConnInfo->UsingConnect() &&
+                   !mHasTLSTransportLayer;
+  if (spdyProxy) {
+    RefPtr<nsHttpConnectionInfo> wildCardProxyCi;
+    rv = mConnInfo->CreateWildCard(getter_AddRefs(wildCardProxyCi));
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+    gHttpHandler->ConnMgr()->MoveToWildCardConnEntry(mConnInfo, wildCardProxyCi,
+                                                     this);
+    mConnInfo = wildCardProxyCi;
+    MOZ_ASSERT(mConnInfo);
+  }
+
+  if (!mDid0RTTSpdy && mTransaction) {
+    if (spdyProxy) {
+      if (NS_FAILED(status)) {
+        // proxy upgrade needs Restartable for transaction reset
+        // note that using NonSticky here won't work because it breaks
+        // netwerk/test/unit/test_websocket_server.js - h1 ws with h2 proxy
+        mTransaction->MakeRestartable();
+        ResetTransaction(std::move(mTransaction));
+        mTransaction = nullptr;
+      } else {
+        for (auto trans : list) {
+          if (!mSpdySession->Connection()) {
+            mSpdySession->SetConnection(trans->Connection());
+          }
+          trans->SetConnection(nullptr);
+          trans->DoNotRemoveAltSvc();
+          trans->Close(NS_ERROR_NET_RESET);
+        }
+      }
+    } else {
+      rv = MoveTransactionsToSpdy(status, list);
+      if (NS_FAILED(rv)) {
+        return;
+      }
+    }
+  }
+
+  // Disable TCP Keepalives - use SPDY ping instead.
+  rv = DisableTCPKeepalives();
+  if (NS_FAILED(rv)) {
+    LOG(
+        ("nsHttpConnection::StartSpdy [%p] DisableTCPKeepalives failed "
+         "rv[0x%" PRIx32 "]",
+         this, static_cast<uint32_t>(rv)));
+  }
+
+  mIdleTimeout = gHttpHandler->SpdyTimeout() * mDefaultTimeoutFactor;
+
+  mTransaction = mSpdySession;
+
+  if (mDontReuse) {
+    mSpdySession->DontReuse();
+  }
+}
+
+void nsHttpConnection::PostProcessNPNSetup(bool handshakeSucceeded,
+                                           bool hasSecurityInfo,
+                                           bool earlyDataUsed) {
+  if (mTransaction) {
+    mTransaction->OnTransportStatus(mSocketTransport,
+                                    NS_NET_STATUS_TLS_HANDSHAKE_ENDED, 0);
+  }
+
+  // this is happening after the bootstrap was originally written to. so update
+  // it.
+  if (mTransaction && mTransaction->QueryNullTransaction() &&
+      (mBootstrappedTimings.secureConnectionStart.IsNull() ||
+       mBootstrappedTimings.tcpConnectEnd.IsNull())) {
+    mBootstrappedTimings.secureConnectionStart =
+        mTransaction->QueryNullTransaction()->GetSecureConnectionStart();
+    mBootstrappedTimings.tcpConnectEnd =
+        mTransaction->QueryNullTransaction()->GetTcpConnectEnd();
+  }
+
+  if (hasSecurityInfo) {
+    mBootstrappedTimings.connectEnd = TimeStamp::Now();
+  }
+
+  if (earlyDataUsed) {
+    // Didn't get 0RTT OK, back out of the "attempting 0RTT" state
+    LOG(("nsHttpConnection::PostProcessNPNSetup [this=%p] 0rtt failed", this));
+    if (mTransaction && NS_FAILED(mTransaction->Finish0RTT(true, true))) {
+      mTransaction->Close(NS_ERROR_NET_RESET);
+    }
+    mContentBytesWritten0RTT = 0;
+    if (mDid0RTTSpdy) {
+      Reset0RttForSpdy();
+    }
+  }
+
+  if (hasSecurityInfo) {
+    // Telemetry for tls failure rate with and without esni;
+    bool echConfigUsed = false;
+    mSocketTransport->GetEchConfigUsed(&echConfigUsed);
+    TlsHandshakeResult result =
+        echConfigUsed
+            ? (handshakeSucceeded ? TlsHandshakeResult::EchConfigSuccessful
+                                  : TlsHandshakeResult::EchConfigFailed)
+            : (handshakeSucceeded ? TlsHandshakeResult::NoEchConfigSuccessful
+                                  : TlsHandshakeResult::NoEchConfigFailed);
+    Telemetry::Accumulate(Telemetry::ECHCONFIG_SUCCESS_RATE, result);
+  }
+}
+
+void nsHttpConnection::Reset0RttForSpdy() {
+  // Reset the work done by Start0RTTSpdy
+  mUsingSpdyVersion = SpdyVersion::NONE;
+  mTransaction = nullptr;
+  mSpdySession = nullptr;
+  // We have to reset this here, just in case we end up starting spdy again,
+  // so it can actually do everything it needs to do.
+  mDid0RTTSpdy = false;
+}
+
+// called on the socket thread
+nsresult nsHttpConnection::Activate(nsAHttpTransaction* trans, uint32_t caps,
+                                    int32_t pri) {
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+  LOG1(("nsHttpConnection::Activate [this=%p trans=%p caps=%x]\n", this, trans,
+        caps));
+
+  if (!mExperienced && !trans->IsNullTransaction()) {
+    mHasFirstHttpTransaction = true;
+    if (mTlsHandshaker->NPNComplete()) {
+      mExperienced = true;
+    }
+    if (mBootstrappedTimingsSet) {
+      mBootstrappedTimingsSet = false;
+      nsHttpTransaction* hTrans = trans->QueryHttpTransaction();
+      if (hTrans) {
+        hTrans->BootstrapTimings(mBootstrappedTimings);
+        SetUrgentStartPreferred(hTrans->GetClassOfService().Flags() &
+                                nsIClassOfService::UrgentStart);
+      }
+    }
+    mBootstrappedTimings = TimingStruct();
+  }
+
+  if (caps & NS_HTTP_LARGE_KEEPALIVE) {
+    mDefaultTimeoutFactor = StaticPrefs::network_http_largeKeepaliveFactor();
+  }
+
+  mTransactionCaps = caps;
+  mPriority = pri;
+
+  if (mHasFirstHttpTransaction && mExperienced) {
+    mHasFirstHttpTransaction = false;
+    mExperienceState |= ConnectionExperienceState::Experienced;
+  }
+
+  if (mTransaction && (mUsingSpdyVersion != SpdyVersion::NONE)) {
+    return AddTransaction(trans, pri);
+  }
+
+  NS_ENSURE_ARG_POINTER(trans);
+  NS_ENSURE_TRUE(!mTransaction, NS_ERROR_IN_PROGRESS);
+
+  // reset the read timers to wash away any idle time
+  mLastWriteTime = mLastReadTime = PR_IntervalNow();
+
+  // Connection failures are Activated() just like regular transacions.
+  // If we don't have a confirmation of a connected socket then test it
+  // with a write() to get relevant error code.
+  if (NS_FAILED(mErrorBeforeConnect)) {
+    mSocketOutCondition = mErrorBeforeConnect;
+    mTransaction = trans;
+    CloseTransaction(mTransaction, mSocketOutCondition);
+    return mSocketOutCondition;
+  }
+
+  if (!mConnectedTransport) {
+    uint32_t count;
+    mSocketOutCondition = NS_ERROR_FAILURE;
+    if (mSocketOut) {
+      mSocketOutCondition = mSocketOut->Write("", 0, &count);
+    }
+    if (NS_FAILED(mSocketOutCondition) &&
+        mSocketOutCondition != NS_BASE_STREAM_WOULD_BLOCK) {
+      LOG(("nsHttpConnection::Activate [this=%p] Bad Socket %" PRIx32 "\n",
+           this, static_cast<uint32_t>(mSocketOutCondition)));
+      mSocketOut->AsyncWait(nullptr, 0, 0, nullptr);
+      mTransaction = trans;
+      CloseTransaction(mTransaction, mSocketOutCondition);
+      return mSocketOutCondition;
+    }
+  }
+
+  // Update security callbacks
+  nsCOMPtr<nsIInterfaceRequestor> callbacks;
+  trans->GetSecurityCallbacks(getter_AddRefs(callbacks));
+  SetSecurityCallbacks(callbacks);
+  mTlsHandshaker->SetupSSL(mInSpdyTunnel, mForcePlainText);
+  if (mTlsHandshaker->NPNComplete()) {
+    // For non-HTTPS connection, change the state to TRANSFERING directly.
+    ChangeConnectionState(ConnectionState::TRANSFERING);
+  } else {
+    ChangeConnectionState(ConnectionState::TLS_HANDSHAKING);
+  }
+
+  // take ownership of the transaction
+  mTransaction = trans;
+
+  nsCOMPtr<nsITLSSocketControl> tlsSocketControl;
+  if (NS_SUCCEEDED(mSocketTransport->GetTlsSocketControl(
+          getter_AddRefs(tlsSocketControl))) &&
+      tlsSocketControl) {
+    tlsSocketControl->SetBrowserId(mTransaction->BrowserId());
+  }
+
+  MOZ_ASSERT(!mIdleMonitoring, "Activating a connection with an Idle Monitor");
+  mIdleMonitoring = false;
+
+  // set mKeepAlive according to what will be requested
+  mKeepAliveMask = mKeepAlive = (caps & NS_HTTP_ALLOW_KEEPALIVE);
+
+  mTransactionDisallowHttp3 |= (caps & NS_HTTP_DISALLOW_HTTP3);
+
+  // need to handle HTTP CONNECT tunnels if this is the first time if
+  // we are tunneling through a proxy
+  nsresult rv = CheckTunnelIsNeeded();
+  if (NS_FAILED(rv)) goto failed_activation;
+
+  // Clear the per activation counter
+  mCurrentBytesRead = 0;
+
+  // The overflow state is not needed between activations
+  mInputOverflow = nullptr;
+
+  mResponseTimeoutEnabled = gHttpHandler->ResponseTimeoutEnabled() &&
+                            mTransaction->ResponseTimeout() > 0 &&
+                            mTransaction->ResponseTimeoutEnabled();
+
+  rv = StartShortLivedTCPKeepalives();
+  if (NS_FAILED(rv)) {
+    LOG(
+        ("nsHttpConnection::Activate [%p] "
+         "StartShortLivedTCPKeepalives failed rv[0x%" PRIx32 "]",
+         this, static_cast<uint32_t>(rv)));
+  }
+
+  trans->OnActivated();
+
+  rv = OnOutputStreamReady(mSocketOut);
+
+  if (NS_SUCCEEDED(rv) && mContinueHandshakeDone) {
+    mContinueHandshakeDone();
+  }
+  mContinueHandshakeDone = nullptr;
+
+failed_activation:
+  if (NS_FAILED(rv)) {
+    mTransaction = nullptr;
+  }
+
+  return rv;
+}
+
+nsresult nsHttpConnection::AddTransaction(nsAHttpTransaction* httpTransaction,
+                                          int32_t priority) {
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+  MOZ_ASSERT(mSpdySession && (mUsingSpdyVersion != SpdyVersion::NONE),
+             "AddTransaction to live http connection without spdy/quic");
+
+  // If this is a wild card nshttpconnection (i.e. a spdy proxy) then
+  // it is important to start the stream using the specific connection
+  // info of the transaction to ensure it is routed on the right tunnel
+
+  nsHttpConnectionInfo* transCI = httpTransaction->ConnectionInfo();
+
+  bool needTunnel = transCI->UsingHttpsProxy();
+  needTunnel = needTunnel && !mHasTLSTransportLayer;
+  needTunnel = needTunnel && transCI->UsingConnect();
+  needTunnel = needTunnel && httpTransaction->QueryHttpTransaction();
+
+  // Let the transaction know that the tunnel is already established and we
+  // don't need to setup the tunnel again.
+  if (transCI->UsingConnect() && mEverUsedSpdy && mHasTLSTransportLayer) {
+    httpTransaction->OnProxyConnectComplete(200);
+  }
+
+  LOG(("nsHttpConnection::AddTransaction [this=%p] for %s%s", this,
+       mSpdySession ? "SPDY" : "QUIC", needTunnel ? " over tunnel" : ""));
+
+  if (mSpdySession) {
+    if (!mSpdySession->AddStream(httpTransaction, priority, mCallbacks)) {
+      MOZ_ASSERT(false);  // this cannot happen!
+      httpTransaction->Close(NS_ERROR_ABORT);
+      return NS_ERROR_FAILURE;
+    }
+  }
+
+  Unused << ResumeSend();
+  return NS_OK;
+}
+
+nsresult nsHttpConnection::CreateTunnelStream(
+    nsAHttpTransaction* httpTransaction, nsHttpConnection** aHttpConnection,
+    bool aIsWebSocket) {
+  if (!mSpdySession) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  RefPtr<nsHttpConnection> conn = mSpdySession->CreateTunnelStream(
+      httpTransaction, mCallbacks, mRtt, aIsWebSocket);
+  // We need to store the refrence of the Http2Session in the tunneled
+  // connection, so when nsHttpConnection::DontReuse is called the Http2Session
+  // can't be reused.
+  if (aIsWebSocket) {
+    LOG(
+        ("nsHttpConnection::CreateTunnelStream %p Set h2 session %p to "
+         "tunneled conn %p",
+         this, mSpdySession.get(), conn.get()));
+    conn->mWebSocketHttp2Session = mSpdySession;
+  }
+  conn.forget(aHttpConnection);
+  return NS_OK;
+}
+
+void nsHttpConnection::Close(nsresult reason, bool aIsShutdown) {
+  LOG(("nsHttpConnection::Close [this=%p reason=%" PRIx32
+       " mExperienceState=%x]\n",
+       this, static_cast<uint32_t>(reason),
+       static_cast<uint32_t>(mExperienceState)));
+
+  if (mConnectionState != ConnectionState::CLOSED) {
+    RecordConnectionCloseTelemetry(reason);
+    ChangeConnectionState(ConnectionState::CLOSED);
+  }
+
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+  mTlsHandshaker->NotifyClose();
+  mContinueHandshakeDone = nullptr;
+  mWebSocketHttp2Session = nullptr;
+  // Ensure TCP keepalive timer is stopped.
+  if (mTCPKeepaliveTransitionTimer) {
+    mTCPKeepaliveTransitionTimer->Cancel();
+    mTCPKeepaliveTransitionTimer = nullptr;
+  }
+  if (mForceSendTimer) {
+    mForceSendTimer->Cancel();
+    mForceSendTimer = nullptr;
+  }
+
+  if (!mTrafficCategory.IsEmpty()) {
+    HttpTrafficAnalyzer* hta = gHttpHandler->GetHttpTrafficAnalyzer();
+    if (hta) {
+      hta->IncrementHttpConnection(std::move(mTrafficCategory));
+      MOZ_ASSERT(mTrafficCategory.IsEmpty());
+    }
+  }
+
+  nsCOMPtr<nsITLSSocketControl> tlsSocketControl;
+  GetTLSSocketControl(getter_AddRefs(tlsSocketControl));
+  if (tlsSocketControl) {
+    tlsSocketControl->SetHandshakeCallbackListener(nullptr);
+  }
+
+  if (NS_FAILED(reason)) {
+    if (mIdleMonitoring) EndIdleMonitoring();
+
+    // The connection and security errors clear out alt-svc mappings
+    // in case any previously validated ones are now invalid
+    if (((reason == NS_ERROR_NET_RESET) ||
+         (NS_ERROR_GET_MODULE(reason) == NS_ERROR_MODULE_SECURITY)) &&
+        mConnInfo && !(mTransactionCaps & NS_HTTP_ERROR_SOFTLY)) {
+      gHttpHandler->ClearHostMapping(mConnInfo);
+    }
+    if (mTlsHandshaker->EarlyDataWasAvailable() &&
+        SecurityErrorThatMayNeedRestart(reason)) {
+      gHttpHandler->Exclude0RttTcp(mConnInfo);
+    }
+
+    if (mSocketTransport) {
+      mSocketTransport->SetEventSink(nullptr, nullptr);
+
+      // If there are bytes sitting in the input queue then read them
+      // into a junk buffer to avoid generating a tcp rst by closing a
+      // socket with data pending. TLS is a classic case of this where
+      // a Alert record might be superfulous to a clean HTTP/SPDY shutdown.
+      // Never block to do this and limit it to a small amount of data.
+      // During shutdown just be fast!
+      if (mSocketIn && !aIsShutdown && !mInSpdyTunnel) {
+        char buffer[4000];
+        uint32_t count, total = 0;
+        nsresult rv;
+        do {
+          rv = mSocketIn->Read(buffer, 4000, &count);
+          if (NS_SUCCEEDED(rv)) total += count;
+        } while (NS_SUCCEEDED(rv) && count > 0 && total < 64000);
+        LOG(("nsHttpConnection::Close drained %d bytes\n", total));
+      }
+
+      mSocketTransport->SetSecurityCallbacks(nullptr);
+      mSocketTransport->Close(reason);
+      if (mSocketOut) mSocketOut->AsyncWait(nullptr, 0, 0, nullptr);
+    }
+    mKeepAlive = false;
+  }
+}
+
+void nsHttpConnection::MarkAsDontReuse() {
+  LOG(("nsHttpConnection::MarkAsDontReuse %p\n", this));
+  mKeepAliveMask = false;
+  mKeepAlive = false;
+  mDontReuse = true;
+  mIdleTimeout = 0;
+}
+
+void nsHttpConnection::DontReuse() {
+  LOG(("nsHttpConnection::DontReuse %p spdysession=%p\n", this,
+       mSpdySession.get()));
+  MarkAsDontReuse();
+  if (mSpdySession) {
+    mSpdySession->DontReuse();
+  } else if (mWebSocketHttp2Session) {
+    LOG(("nsHttpConnection::DontReuse %p mWebSocketHttp2Session=%p\n", this,
+         mWebSocketHttp2Session.get()));
+    mWebSocketHttp2Session->DontReuse();
+  }
+}
+
+bool nsHttpConnection::TestJoinConnection(const nsACString& hostname,
+                                          int32_t port) {
+  if (mSpdySession && CanDirectlyActivate()) {
+    return mSpdySession->TestJoinConnection(hostname, port);
+  }
+
+  return false;
+}
+
+bool nsHttpConnection::JoinConnection(const nsACString& hostname,
+                                      int32_t port) {
+  if (mSpdySession && CanDirectlyActivate()) {
+    return mSpdySession->JoinConnection(hostname, port);
+  }
+
+  return false;
+}
+
+bool nsHttpConnection::CanReuse() {
+  if (mDontReuse || !mRemainingConnectionUses) {
+    return false;
+  }
+
+  if ((mTransaction ? (mTransaction->IsDone() ? 0U : 1U) : 0U) >=
+      mRemainingConnectionUses) {
+    return false;
+  }
+
+  bool canReuse;
+  if (mSpdySession) {
+    canReuse = mSpdySession->CanReuse();
+  } else {
+    canReuse = IsKeepAlive();
+  }
+
+  canReuse = canReuse && (IdleTime() < mIdleTimeout) && IsAlive();
+
+  // An idle persistent connection should not have data waiting to be read
+  // before a request is sent. Data here is likely a 408 timeout response
+  // which we would deal with later on through the restart logic, but that
+  // path is more expensive than just closing the socket now.
+
+  uint64_t dataSize;
+  if (canReuse && mSocketIn && (mUsingSpdyVersion == SpdyVersion::NONE) &&
+      mHttp1xTransactionCount &&
+      NS_SUCCEEDED(mSocketIn->Available(&dataSize)) && dataSize) {
+    LOG(
+        ("nsHttpConnection::CanReuse %p %s"
+         "Socket not reusable because read data pending (%" PRIu64 ") on it.\n",
+         this, mConnInfo->Origin(), dataSize));
+    canReuse = false;
+  }
+  return canReuse;
+}
+
+bool nsHttpConnection::CanDirectlyActivate() {
+  // return true if a new transaction can be addded to ths connection at any
+  // time through Activate(). In practice this means this is a healthy SPDY
+  // connection with room for more concurrent streams.
+
+  return UsingSpdy() && CanReuse() && mSpdySession &&
+         mSpdySession->RoomForMoreStreams();
+}
+
+PRIntervalTime nsHttpConnection::IdleTime() {
+  return mSpdySession ? mSpdySession->IdleTime()
+                      : (PR_IntervalNow() - mLastReadTime);
+}
+
+// returns the number of seconds left before the allowable idle period
+// expires, or 0 if the period has already expied.
+uint32_t nsHttpConnection::TimeToLive() {
+  LOG(("nsHttpConnection::TTL: %p %s idle %d timeout %d\n", this,
+       mConnInfo->Origin(), IdleTime(), mIdleTimeout));
+
+  if (IdleTime() >= mIdleTimeout) {
+    return 0;
+  }
+
+  uint32_t timeToLive = PR_IntervalToSeconds(mIdleTimeout - IdleTime());
+
+  // a positive amount of time can be rounded to 0. Because 0 is used
+  // as the expiration signal, round all values from 0 to 1 up to 1.
+  if (!timeToLive) {
+    timeToLive = 1;
+  }
+  return timeToLive;
+}
+
+bool nsHttpConnection::IsAlive() {
+  if (!mSocketTransport || !mConnectedTransport) return false;
+
+  // SocketTransport::IsAlive can run the SSL state machine, so make sure
+  // the NPN options are set before that happens.
+  mTlsHandshaker->SetupSSL(mInSpdyTunnel, mForcePlainText);
+
+  bool alive;
+  nsresult rv = mSocketTransport->IsAlive(&alive);
+  if (NS_FAILED(rv)) alive = false;
+
+// #define TEST_RESTART_LOGIC
+#ifdef TEST_RESTART_LOGIC
+  if (!alive) {
+    LOG(("pretending socket is still alive to test restart logic\n"));
+    alive = true;
+  }
+#endif
+
+  return alive;
+}
+
+void nsHttpConnection::SetUrgentStartPreferred(bool urgent) {
+  if (mExperienced && !mUrgentStartPreferredKnown) {
+    // Set only according the first ever dispatched non-null transaction
+    mUrgentStartPreferredKnown = true;
+    mUrgentStartPreferred = urgent;
+    LOG(("nsHttpConnection::SetUrgentStartPreferred [this=%p urgent=%d]", this,
+         urgent));
+  }
+}
+
+//----------------------------------------------------------------------------
+// nsHttpConnection::nsAHttpConnection compatible methods
+//----------------------------------------------------------------------------
+
+nsresult nsHttpConnection::OnHeadersAvailable(nsAHttpTransaction* trans,
+                                              nsHttpRequestHead* requestHead,
+                                              nsHttpResponseHead* responseHead,
+                                              bool* reset) {
+  LOG(
+      ("nsHttpConnection::OnHeadersAvailable [this=%p trans=%p "
+       "response-head=%p]\n",
+       this, trans, responseHead));
+
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+  NS_ENSURE_ARG_POINTER(trans);
+  MOZ_ASSERT(responseHead, "No response head?");
+
+  if (mInSpdyTunnel) {
+    DebugOnly<nsresult> rv =
+        responseHead->SetHeader(nsHttp::X_Firefox_Spdy_Proxy, "true"_ns);
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+  }
+
+  // we won't change our keep-alive policy unless the server has explicitly
+  // told us to do so.
+
+  // inspect the connection headers for keep-alive info provided the
+  // transaction completed successfully. In the case of a non-sensical close
+  // and keep-alive favor the close out of conservatism.
+
+  bool explicitKeepAlive = false;
+  bool explicitClose =
+      responseHead->HasHeaderValue(nsHttp::Connection, "close") ||
+      responseHead->HasHeaderValue(nsHttp::Proxy_Connection, "close");
+  if (!explicitClose) {
+    explicitKeepAlive =
+        responseHead->HasHeaderValue(nsHttp::Connection, "keep-alive") ||
+        responseHead->HasHeaderValue(nsHttp::Proxy_Connection, "keep-alive");
+  }
+
+  // deal with 408 Server Timeouts
+  uint16_t responseStatus = responseHead->Status();
+  if (responseStatus == 408) {
+    // timeouts that are not caused by persistent connection reuse should
+    // not be retried for browser compatibility reasons. bug 907800. The
+    // server driven close is implicit in the 408.
+    explicitClose = true;
+    explicitKeepAlive = false;
+  }
+
+  if ((responseHead->Version() < HttpVersion::v1_1) ||
+      (requestHead->Version() < HttpVersion::v1_1)) {
+    // HTTP/1.0 connections are by default NOT persistent
+    mKeepAlive = explicitKeepAlive;
+  } else {
+    // HTTP/1.1 connections are by default persistent
+    mKeepAlive = !explicitClose;
+  }
+  mKeepAliveMask = mKeepAlive;
+
+  // if this connection is persistent, then the server may send a "Keep-Alive"
+  // header specifying the maximum number of times the connection can be
+  // reused as well as the maximum amount of time the connection can be idle
+  // before the server will close it.  we ignore the max reuse count, because
+  // a "keep-alive" connection is by definition capable of being reused, and
+  // we only care about being able to reuse it once.  if a timeout is not
+  // specified then we use our advertized timeout value.
+  bool foundKeepAliveMax = false;
+  if (mKeepAlive) {
+    nsAutoCString keepAlive;
+    Unused << responseHead->GetHeader(nsHttp::Keep_Alive, keepAlive);
+
+    if (mUsingSpdyVersion == SpdyVersion::NONE) {
+      const char* cp = nsCRT::strcasestr(keepAlive.get(), "timeout=");
+      if (cp) {
+        mIdleTimeout = PR_SecondsToInterval((uint32_t)atoi(cp + 8));
+      } else {
+        mIdleTimeout = gHttpHandler->IdleTimeout() * mDefaultTimeoutFactor;
+      }
+
+      cp = nsCRT::strcasestr(keepAlive.get(), "max=");
+      if (cp) {
+        int maxUses = atoi(cp + 4);
+        if (maxUses > 0) {
+          foundKeepAliveMax = true;
+          mRemainingConnectionUses = static_cast<uint32_t>(maxUses);
+        }
+      }
+    }
+
+    LOG(("Connection can be reused [this=%p idle-timeout=%usec]\n", this,
+         PR_IntervalToSeconds(mIdleTimeout)));
+  }
+
+  if (!foundKeepAliveMax && mRemainingConnectionUses &&
+      (mUsingSpdyVersion == SpdyVersion::NONE)) {
+    --mRemainingConnectionUses;
+  }
+
+  switch (mState) {
+    case HttpConnectionState::SETTING_UP_TUNNEL: {
+      nsHttpTransaction* trans = mTransaction->QueryHttpTransaction();
+      // Distinguish SETTING_UP_TUNNEL for proxy or websocket via proxy
+      // See bug 1848013. Do not call HandleTunnelResponse for a tunnel
+      // connection created for WebSocket.
+      if (trans && trans->IsWebsocketUpgrade() &&
+          (trans->GetProxyConnectResponseCode() == 200 ||
+           (mForWebSocket && mInSpdyTunnel))) {
+        HandleWebSocketResponse(requestHead, responseHead, responseStatus);
+      } else {
+        HandleTunnelResponse(responseStatus, reset);
+      }
+      break;
+    }
+    default:
+      if (requestHead->HasHeader(nsHttp::Upgrade)) {
+        HandleWebSocketResponse(requestHead, responseHead, responseStatus);
+      } else if (responseStatus == 101) {
+        // We got an 101 but we are not asking of a WebSsocket?
+        Close(NS_ERROR_ABORT);
+      }
+  }
+
+  mLastHttpResponseVersion = responseHead->Version();
+
+  return NS_OK;
+}
+
+void nsHttpConnection::HandleTunnelResponse(uint16_t responseStatus,
+                                            bool* reset) {
+  LOG(("nsHttpConnection::HandleTunnelResponse()"));
+  MOZ_ASSERT(TunnelSetupInProgress());
+  MOZ_ASSERT(mProxyConnectStream);
+  MOZ_ASSERT(mUsingSpdyVersion == SpdyVersion::NONE,
+             "SPDY NPN Complete while using proxy connect stream");
+  // If we're doing a proxy connect, we need to check whether or not
+  // it was successful.  If so, we have to reset the transaction and step-up
+  // the socket connection if using SSL. Finally, we have to wake up the
+  // socket write request.
+
+  if (responseStatus == 200) {
+    ChangeState(HttpConnectionState::REQUEST);
+  }
+  mProxyConnectStream = nullptr;
+  bool isHttps = mTransaction ? mTransaction->ConnectionInfo()->EndToEndSSL()
+                              : mConnInfo->EndToEndSSL();
+  bool onlyConnect = mTransactionCaps & NS_HTTP_CONNECT_ONLY;
+
+  mTransaction->OnProxyConnectComplete(responseStatus);
+  if (responseStatus == 200) {
+    LOG(("proxy CONNECT succeeded! endtoendssl=%d onlyconnect=%d\n", isHttps,
+         onlyConnect));
+    // If we're only connecting, we don't need to reset the transaction
+    // state. We need to upgrade the socket now without doing the actual
+    // http request.
+    if (!onlyConnect) {
+      *reset = true;
+    }
+    nsresult rv;
+    // CONNECT only flag doesn't do the tls setup. https here only
+    // ensures a proxy tunnel was used not that tls is setup.
+    if (isHttps) {
+      if (!onlyConnect) {
+        if (mConnInfo->UsingHttpsProxy()) {
+          LOG(("%p new TLSFilterTransaction %s %d\n", this, mConnInfo->Origin(),
+               mConnInfo->OriginPort()));
+          SetupSecondaryTLS();
+        }
+
+        rv = mTlsHandshaker->InitSSLParams(false, true);
+        LOG(("InitSSLParams [rv=%" PRIx32 "]\n", static_cast<uint32_t>(rv)));
+      } else {
+        // We have an https protocol but the CONNECT only flag was
+        // specified. The consumer only wants a raw socket to the
+        // proxy. We have to mark this as complete to finish the
+        // transaction and be upgraded. OnSocketReadable() uses this
+        // to detect an inactive tunnel and blocks completion.
+        mTlsHandshaker->SetNPNComplete();
+      }
+    }
+    rv = mSocketOut->AsyncWait(this, 0, 0, nullptr);
+    // XXX what if this fails -- need to handle this error
+    MOZ_ASSERT(NS_SUCCEEDED(rv), "mSocketOut->AsyncWait failed");
+  } else {
+    LOG(("proxy CONNECT failed! endtoendssl=%d onlyconnect=%d\n", isHttps,
+         onlyConnect));
+    mTransaction->SetProxyConnectFailed();
+  }
+}
+
+void nsHttpConnection::HandleWebSocketResponse(nsHttpRequestHead* requestHead,
+                                               nsHttpResponseHead* responseHead,
+                                               uint16_t responseStatus) {
+  LOG(("nsHttpConnection::HandleWebSocketResponse()"));
+
+  // Don't use persistent connection for Upgrade unless there's an auth failure:
+  // some proxies expect to see auth response on persistent connection.
+  // Also allow persistent conn for h2, as we don't want to waste connections
+  // for multiplexed upgrades.
+  if (responseStatus != 401 && responseStatus != 407 && !mSpdySession) {
+    LOG(("HTTP Upgrade in play - disable keepalive for http/1.x\n"));
+    MarkAsDontReuse();
+  }
+
+  // the new Http2StreamWebSocket breaks wpt on
+  // h2 basic authentication 401, due to MakeSticky() work around
+  // so we DontReuse() in this circumstance
+  if (mInSpdyTunnel && (responseStatus == 401 || responseStatus == 407)) {
+    MarkAsDontReuse();
+    return;
+  }
+
+  if (responseStatus == 101) {
+    nsAutoCString upgradeReq;
+    bool hasUpgradeReq =
+        NS_SUCCEEDED(requestHead->GetHeader(nsHttp::Upgrade, upgradeReq));
+    nsAutoCString upgradeResp;
+    bool hasUpgradeResp =
+        NS_SUCCEEDED(responseHead->GetHeader(nsHttp::Upgrade, upgradeResp));
+    if (!hasUpgradeReq || !hasUpgradeResp ||
+        !nsHttp::FindToken(upgradeResp.get(), upgradeReq.get(),
+                           HTTP_HEADER_VALUE_SEPS)) {
+      LOG(("HTTP 101 Upgrade header mismatch req = %s, resp = %s\n",
+           upgradeReq.get(),
+           !upgradeResp.IsEmpty() ? upgradeResp.get()
+                                  : "RESPONSE's nsHttp::Upgrade is empty"));
+      Close(NS_ERROR_ABORT);
+    } else {
+      LOG(("HTTP Upgrade Response to %s\n", upgradeResp.get()));
+    }
+  }
+}
+
+bool nsHttpConnection::IsReused() {
+  if (mIsReused) return true;
+  if (!mConsiderReusedAfterInterval) return false;
+
+  // ReusedAfter allows a socket to be consider reused only after a certain
+  // interval of time has passed
+  return (PR_IntervalNow() - mConsiderReusedAfterEpoch) >=
+         mConsiderReusedAfterInterval;
+}
+
+void nsHttpConnection::SetIsReusedAfter(uint32_t afterMilliseconds) {
+  mConsiderReusedAfterEpoch = PR_IntervalNow();
+  mConsiderReusedAfterInterval = PR_MillisecondsToInterval(afterMilliseconds);
+}
+
+nsresult nsHttpConnection::TakeTransport(nsISocketTransport** aTransport,
+                                         nsIAsyncInputStream** aInputStream,
+                                         nsIAsyncOutputStream** aOutputStream) {
+  if (mUsingSpdyVersion != SpdyVersion::NONE) return NS_ERROR_FAILURE;
+  if (mTransaction && !mTransaction->IsDone()) return NS_ERROR_IN_PROGRESS;
+  if (!(mSocketTransport && mSocketIn && mSocketOut)) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
+  if (mInputOverflow) mSocketIn = mInputOverflow.forget();
+
+  // Change TCP Keepalive frequency to long-lived if currently short-lived.
+  if (mTCPKeepaliveConfig == kTCPKeepaliveShortLivedConfig) {
+    if (mTCPKeepaliveTransitionTimer) {
+      mTCPKeepaliveTransitionTimer->Cancel();
+      mTCPKeepaliveTransitionTimer = nullptr;
+    }
+    nsresult rv = StartLongLivedTCPKeepalives();
+    LOG(
+        ("nsHttpConnection::TakeTransport [%p] calling "
+         "StartLongLivedTCPKeepalives",
+         this));
+    if (NS_FAILED(rv)) {
+      LOG(
+          ("nsHttpConnection::TakeTransport [%p] "
+           "StartLongLivedTCPKeepalives failed rv[0x%" PRIx32 "]",
+           this, static_cast<uint32_t>(rv)));
+    }
+  }
+
+  if (mHasTLSTransportLayer) {
+    RefPtr<TLSTransportLayer> tlsTransportLayer =
+        do_QueryObject(mSocketTransport);
+    if (tlsTransportLayer) {
+      // This transport layer is no longer owned by this connection.
+      tlsTransportLayer->ReleaseOwner();
+    }
+  }
+
+  mSocketTransport->SetSecurityCallbacks(nullptr);
+  mSocketTransport->SetEventSink(nullptr, nullptr);
+
+  mSocketTransport.forget(aTransport);
+  mSocketIn.forget(aInputStream);
+  mSocketOut.forget(aOutputStream);
+
+  return NS_OK;
+}
+
+uint32_t nsHttpConnection::ReadTimeoutTick(PRIntervalTime now) {
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+
+  // make sure timer didn't tick before Activate()
+  if (!mTransaction) return UINT32_MAX;
+
+  // Spdy implements some timeout handling using the SPDY ping frame.
+  if (mSpdySession) {
+    return mSpdySession->ReadTimeoutTick(now);
+  }
+
+  uint32_t nextTickAfter = UINT32_MAX;
+  // Timeout if the response is taking too long to arrive.
+  if (mResponseTimeoutEnabled) {
+    NS_WARNING_ASSERTION(
+        gHttpHandler->ResponseTimeoutEnabled(),
+        "Timing out a response, but response timeout is disabled!");
+
+    PRIntervalTime initialResponseDelta = now - mLastWriteTime;
+
+    if (initialResponseDelta > mTransaction->ResponseTimeout()) {
+      LOG(("canceling transaction: no response for %ums: timeout is %dms\n",
+           PR_IntervalToMilliseconds(initialResponseDelta),
+           PR_IntervalToMilliseconds(mTransaction->ResponseTimeout())));
+
+      mResponseTimeoutEnabled = false;
+      SetCloseReason(ConnectionCloseReason::IDLE_TIMEOUT);
+      // This will also close the connection
+      CloseTransaction(mTransaction, NS_ERROR_NET_TIMEOUT);
+      return UINT32_MAX;
+    }
+    nextTickAfter = PR_IntervalToSeconds(mTransaction->ResponseTimeout()) -
+                    PR_IntervalToSeconds(initialResponseDelta);
+    nextTickAfter = std::max(nextTickAfter, 1U);
+  }
+
+  if (!mTlsHandshaker->NPNComplete()) {
+    // We can reuse mLastWriteTime here, because it is set when the
+    // connection is activated and only change when a transaction
+    // succesfullu write to the socket and this can only happen after
+    // the TLS handshake is done.
+    PRIntervalTime initialTLSDelta = now - mLastWriteTime;
+    if (initialTLSDelta >
+        PR_MillisecondsToInterval(gHttpHandler->TLSHandshakeTimeout())) {
+      LOG(
+          ("canceling transaction: tls handshake takes too long: tls handshake "
+           "last %ums, timeout is %dms.",
+           PR_IntervalToMilliseconds(initialTLSDelta),
+           gHttpHandler->TLSHandshakeTimeout()));
+
+      // This will also close the connection
+      SetCloseReason(ConnectionCloseReason::TLS_TIMEOUT);
+      CloseTransaction(mTransaction, NS_ERROR_NET_TIMEOUT);
+      return UINT32_MAX;
+    }
+  }
+
+  return nextTickAfter;
+}
+
+void nsHttpConnection::UpdateTCPKeepalive(nsITimer* aTimer, void* aClosure) {
+  MOZ_ASSERT(aTimer);
+  MOZ_ASSERT(aClosure);
+
+  nsHttpConnection* self = static_cast<nsHttpConnection*>(aClosure);
+
+  if (NS_WARN_IF(self->mUsingSpdyVersion != SpdyVersion::NONE)) {
+    return;
+  }
+
+  // Do not reduce keepalive probe frequency for idle connections.
+  if (self->mIdleMonitoring) {
+    return;
+  }
+
+  nsresult rv = self->StartLongLivedTCPKeepalives();
+  if (NS_FAILED(rv)) {
+    LOG(
+        ("nsHttpConnection::UpdateTCPKeepalive [%p] "
+         "StartLongLivedTCPKeepalives failed rv[0x%" PRIx32 "]",
+         self, static_cast<uint32_t>(rv)));
+  }
+}
+
+void nsHttpConnection::GetTLSSocketControl(
+    nsITLSSocketControl** tlsSocketControl) {
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+  LOG(("nsHttpConnection::GetTLSSocketControl trans=%p socket=%p\n",
+       mTransaction.get(), mSocketTransport.get()));
+
+  *tlsSocketControl = nullptr;
+
+  if (mTransaction && NS_SUCCEEDED(mTransaction->GetTransactionTLSSocketControl(
+                          tlsSocketControl))) {
+    return;
+  }
+
+  if (mSocketTransport &&
+      NS_SUCCEEDED(mSocketTransport->GetTlsSocketControl(tlsSocketControl))) {
+    return;
+  }
+}
+
+nsresult nsHttpConnection::PushBack(const char* data, uint32_t length) {
+  LOG(("nsHttpConnection::PushBack [this=%p, length=%d]\n", this, length));
+
+  if (mInputOverflow) {
+    NS_ERROR("nsHttpConnection::PushBack only one buffer supported");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  mInputOverflow = new nsPreloadedStream(mSocketIn, data, length);
+  return NS_OK;
+}
+
+class HttpConnectionForceIO : public Runnable {
+ public:
+  HttpConnectionForceIO(nsHttpConnection* aConn, bool doRecv)
+      : Runnable("net::HttpConnectionForceIO"), mConn(aConn), mDoRecv(doRecv) {}
+
+  NS_IMETHOD Run() override {
+    MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+
+    if (mDoRecv) {
+      if (!mConn->mSocketIn) return NS_OK;
+      return mConn->OnInputStreamReady(mConn->mSocketIn);
+    }
+
+    MOZ_ASSERT(mConn->mForceSendPending);
+    mConn->mForceSendPending = false;
+
+    if (!mConn->mSocketOut) {
+      return NS_OK;
+    }
+    return mConn->OnOutputStreamReady(mConn->mSocketOut);
+  }
+
+ private:
+  RefPtr<nsHttpConnection> mConn;
+  bool mDoRecv;
+};
+
+nsresult nsHttpConnection::ResumeSend() {
+  LOG(("nsHttpConnection::ResumeSend [this=%p]\n", this));
+
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+
+  if (mSocketOut) {
+    return mSocketOut->AsyncWait(this, 0, 0, nullptr);
+  }
+
+  MOZ_ASSERT_UNREACHABLE("no socket output stream");
+  return NS_ERROR_UNEXPECTED;
+}
+
+nsresult nsHttpConnection::ResumeRecv() {
+  LOG(("nsHttpConnection::ResumeRecv [this=%p]\n", this));
+
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+
+  // the mLastReadTime timestamp is used for finding slowish readers
+  // and can be pretty sensitive. For that reason we actually reset it
+  // when we ask to read (resume recv()) so that when we get called back
+  // with actual read data in OnSocketReadable() we are only measuring
+  // the latency between those two acts and not all the processing that
+  // may get done before the ResumeRecv() call
+  mLastReadTime = PR_IntervalNow();
+
+  if (mSocketIn) {
+    if (mHasTLSTransportLayer) {
+      RefPtr<TLSTransportLayer> tlsTransportLayer =
+          do_QueryObject(mSocketTransport);
+      if (tlsTransportLayer) {
+        bool hasDataToRecv = tlsTransportLayer->HasDataToRecv();
+        if (hasDataToRecv && NS_SUCCEEDED(ForceRecv())) {
+          return NS_OK;
+        }
+        Unused << mSocketIn->AsyncWait(this, 0, 0, nullptr);
+        // We have to return an error here to let the underlying layer know this
+        // connection doesn't read any data.
+        return NS_BASE_STREAM_WOULD_BLOCK;
+      }
+    }
+    return mSocketIn->AsyncWait(this, 0, 0, nullptr);
+  }
+
+  MOZ_ASSERT_UNREACHABLE("no socket input stream");
+  return NS_ERROR_UNEXPECTED;
+}
+
+void nsHttpConnection::ForceSendIO(nsITimer* aTimer, void* aClosure) {
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+  nsHttpConnection* self = static_cast<nsHttpConnection*>(aClosure);
+  MOZ_ASSERT(aTimer == self->mForceSendTimer);
+  self->mForceSendTimer = nullptr;
+  NS_DispatchToCurrentThread(new HttpConnectionForceIO(self, false));
+}
+
+nsresult nsHttpConnection::MaybeForceSendIO() {
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+  // due to bug 1213084 sometimes real I/O events do not get serviced when
+  // NSPR derived I/O events are ready and this can cause a deadlock with
+  // https over https proxying. Normally we would expect the write callback to
+  // be invoked before this timer goes off, but set it at the old windows
+  // tick interval (kForceDelay) as a backup for those circumstances.
+  static const uint32_t kForceDelay = 17;  // ms
+
+  if (mForceSendPending) {
+    return NS_OK;
+  }
+  MOZ_ASSERT(!mForceSendTimer);
+  mForceSendPending = true;
+  return NS_NewTimerWithFuncCallback(getter_AddRefs(mForceSendTimer),
+                                     nsHttpConnection::ForceSendIO, this,
+                                     kForceDelay, nsITimer::TYPE_ONE_SHOT,
+                                     "net::nsHttpConnection::MaybeForceSendIO");
+}
+
+// trigger an asynchronous read
+nsresult nsHttpConnection::ForceRecv() {
+  LOG(("nsHttpConnection::ForceRecv [this=%p]\n", this));
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+
+  return NS_DispatchToCurrentThread(new HttpConnectionForceIO(this, true));
+}
+
+// trigger an asynchronous write
+nsresult nsHttpConnection::ForceSend() {
+  LOG(("nsHttpConnection::ForceSend [this=%p]\n", this));
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+
+  return MaybeForceSendIO();
+}
+
+void nsHttpConnection::BeginIdleMonitoring() {
+  LOG(("nsHttpConnection::BeginIdleMonitoring [this=%p]\n", this));
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+  MOZ_ASSERT(!mTransaction, "BeginIdleMonitoring() while active");
+  MOZ_ASSERT(mUsingSpdyVersion == SpdyVersion::NONE,
+             "Idle monitoring of spdy not allowed");
+
+  LOG(("Entering Idle Monitoring Mode [this=%p]", this));
+  mIdleMonitoring = true;
+  if (mSocketIn) mSocketIn->AsyncWait(this, 0, 0, nullptr);
+}
+
+void nsHttpConnection::EndIdleMonitoring() {
+  LOG(("nsHttpConnection::EndIdleMonitoring [this=%p]\n", this));
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+  MOZ_ASSERT(!mTransaction, "EndIdleMonitoring() while active");
+
+  if (mIdleMonitoring) {
+    LOG(("Leaving Idle Monitoring Mode [this=%p]", this));
+    mIdleMonitoring = false;
+    if (mSocketIn) mSocketIn->AsyncWait(nullptr, 0, 0, nullptr);
+  }
+}
+
+HttpVersion nsHttpConnection::Version() {
+  if (mUsingSpdyVersion != SpdyVersion::NONE) {
+    return HttpVersion::v2_0;
+  }
+  return mLastHttpResponseVersion;
+}
+
+PRIntervalTime nsHttpConnection::LastWriteTime() { return mLastWriteTime; }
+
+//-----------------------------------------------------------------------------
+// nsHttpConnection <private>
+//-----------------------------------------------------------------------------
+
+void nsHttpConnection::CloseTransaction(nsAHttpTransaction* trans,
+                                        nsresult reason, bool aIsShutdown) {
+  LOG(("nsHttpConnection::CloseTransaction[this=%p trans=%p reason=%" PRIx32
+       "]\n",
+       this, trans, static_cast<uint32_t>(reason)));
+
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+
+  if (mCurrentBytesRead > mMaxBytesRead) mMaxBytesRead = mCurrentBytesRead;
+
+  // mask this error code because its not a real error.
+  if (reason == NS_BASE_STREAM_CLOSED) reason = NS_OK;
+
+  if (mUsingSpdyVersion != SpdyVersion::NONE) {
+    DontReuse();
+    // if !mSpdySession then mUsingSpdyVersion must be false for canreuse()
+    mSpdySession->SetCleanShutdown(aIsShutdown);
+    mUsingSpdyVersion = SpdyVersion::NONE;
+    mSpdySession = nullptr;
+  }
+
+  if (mTransaction) {
+    LOG(("  closing associated mTransaction"));
+    mHttp1xTransactionCount += mTransaction->Http1xTransactionCount();
+
+    mTransaction->Close(reason);
+    mTransaction = nullptr;
+  }
+
+  {
+    MutexAutoLock lock(mCallbacksLock);
+    mCallbacks = nullptr;
+  }
+
+  if (NS_FAILED(reason) && (reason != NS_BINDING_RETARGETED)) {
+    Close(reason, aIsShutdown);
+  }
+
+  // flag the connection as reused here for convenience sake.  certainly
+  // it might be going away instead ;-)
+  mIsReused = true;
+}
+
+bool nsHttpConnection::CheckCanWrite0RTTData() {
+  MOZ_ASSERT(mTlsHandshaker->EarlyDataAvailable());
+  nsCOMPtr<nsITLSSocketControl> tlsSocketControl;
+  GetTLSSocketControl(getter_AddRefs(tlsSocketControl));
+  if (!tlsSocketControl) {
+    return false;
+  }
+  nsCOMPtr<nsITransportSecurityInfo> securityInfo;
+  if (NS_FAILED(
+          tlsSocketControl->GetSecurityInfo(getter_AddRefs(securityInfo)))) {
+    return false;
+  }
+  if (!securityInfo) {
+    return false;
+  }
+  nsAutoCString negotiatedNPN;
+  // If the following code fails means that the handshake is not done
+  // yet, so continue writing 0RTT data.
+  nsresult rv = securityInfo->GetNegotiatedNPN(negotiatedNPN);
+  if (NS_FAILED(rv)) {
+    return true;
+  }
+  bool earlyDataAccepted = false;
+  rv = tlsSocketControl->GetEarlyDataAccepted(&earlyDataAccepted);
+  // If 0RTT data is accepted we can continue writing data,
+  // if it is reject stop writing more data.
+  return NS_SUCCEEDED(rv) && earlyDataAccepted;
+}
+
+nsresult nsHttpConnection::OnReadSegment(const char* buf, uint32_t count,
+                                         uint32_t* countRead) {
+  LOG(("nsHttpConnection::OnReadSegment [this=%p]\n", this));
+  if (count == 0) {
+    // some ReadSegments implementations will erroneously call the writer
+    // to consume 0 bytes worth of data.  we must protect against this case
+    // or else we'd end up closing the socket prematurely.
+    NS_ERROR("bad ReadSegments implementation");
+    return NS_ERROR_FAILURE;  // stop iterating
+  }
+
+  // If we are waiting for 0RTT Response, check maybe nss has finished
+  // handshake already.
+  // IsAlive() calls drive the handshake and that may cause nss and necko
+  // to be out of sync.
+  if (mTlsHandshaker->EarlyDataAvailable() && !CheckCanWrite0RTTData()) {
+    MOZ_DIAGNOSTIC_ASSERT(mTlsHandshaker->TlsHandshakeComplitionPending());
+    LOG(
+        ("nsHttpConnection::OnReadSegment Do not write any data, wait"
+         " for EnsureNPNComplete to be called [this=%p]",
+         this));
+    *countRead = 0;
+    return NS_BASE_STREAM_WOULD_BLOCK;
+  }
+
+  nsresult rv = mSocketOut->Write(buf, count, countRead);
+  if (NS_FAILED(rv)) {
+    mSocketOutCondition = rv;
+  } else if (*countRead == 0) {
+    mSocketOutCondition = NS_BASE_STREAM_CLOSED;
+  } else {
+    mLastWriteTime = PR_IntervalNow();
+    mSocketOutCondition = NS_OK;  // reset condition
+    if (!TunnelSetupInProgress()) {
+      mTotalBytesWritten += *countRead;
+      mExperienceState |= ConnectionExperienceState::First_Request_Sent;
+    }
+  }
+
+  return mSocketOutCondition;
+}
+
+nsresult nsHttpConnection::OnSocketWritable() {
+  LOG(("nsHttpConnection::OnSocketWritable [this=%p] host=%s\n", this,
+       mConnInfo->Origin()));
+
+  nsresult rv;
+  uint32_t transactionBytes;
+  bool again = true;
+
+  // Prevent STS thread from being blocked by single OnOutputStreamReady
+  // callback.
+  const uint32_t maxWriteAttempts = 128;
+  uint32_t writeAttempts = 0;
+
+  if (mTransactionCaps & NS_HTTP_CONNECT_ONLY) {
+    if (!mConnInfo->UsingConnect()) {
+      // A CONNECT has been requested for this connection but will never
+      // be performed. This should never happen.
+      MOZ_ASSERT(false, "proxy connect will never happen");
+      LOG(("return failure because proxy connect will never happen\n"));
+      return NS_ERROR_FAILURE;
+    }
+
+    if (mState == HttpConnectionState::REQUEST) {
+      // Don't need to check this each write attempt since it is only
+      // updated after OnSocketWritable completes.
+      // We've already done primary tls (if needed) and sent our CONNECT.
+      // If we're doing a CONNECT only request there's no need to write
+      // the http transaction or do the SSL handshake here.
+      LOG(("return ok because proxy connect successful\n"));
+      return NS_OK;
+    }
+  }
+
+  do {
+    ++writeAttempts;
+    rv = mSocketOutCondition = NS_OK;
+    transactionBytes = 0;
+
+    switch (mState) {
+      case HttpConnectionState::SETTING_UP_TUNNEL:
+        if (mConnInfo->UsingHttpsProxy() &&
+            !mTlsHandshaker->EnsureNPNComplete()) {
+          MOZ_DIAGNOSTIC_ASSERT(!mTlsHandshaker->EarlyDataAvailable());
+          mSocketOutCondition = NS_BASE_STREAM_WOULD_BLOCK;
+        } else {
+          rv = SendConnectRequest(this, &transactionBytes);
+        }
+        break;
+      default: {
+        // The SSL handshake must be completed before the
+        // transaction->readsegments() processing can proceed because we need to
+        // know how to format the request differently for http/1, http/2, spdy,
+        // etc.. and that is negotiated with NPN/ALPN in the SSL handshake.
+        if (!mTlsHandshaker->EnsureNPNComplete() &&
+            (!mTlsHandshaker->EarlyDataUsed() ||
+             mTlsHandshaker->TlsHandshakeComplitionPending())) {
+          // The handshake is not done and we cannot write 0RTT data or nss has
+          // already finished 0RTT data.
+          mSocketOutCondition = NS_BASE_STREAM_WOULD_BLOCK;
+        } else if (!mTransaction) {
+          rv = NS_ERROR_FAILURE;
+          LOG(("  No Transaction In OnSocketWritable\n"));
+        } else if (NS_SUCCEEDED(rv)) {
+          // for non spdy sessions let the connection manager know
+          if (!mReportedSpdy && mTlsHandshaker->NPNComplete()) {
+            mReportedSpdy = true;
+            MOZ_ASSERT(!mEverUsedSpdy);
+            gHttpHandler->ConnMgr()->ReportSpdyConnection(this, false, false);
+          }
+
+          LOG(("  writing transaction request stream\n"));
+          rv = mTransaction->ReadSegmentsAgain(this,
+                                               nsIOService::gDefaultSegmentSize,
+                                               &transactionBytes, &again);
+          if (mTlsHandshaker->EarlyDataUsed()) {
+            mContentBytesWritten0RTT += transactionBytes;
+            if (NS_FAILED(rv) && rv != NS_BASE_STREAM_WOULD_BLOCK) {
+              // If an error happens while writting 0RTT data, restart
+              // the transactiions without 0RTT.
+              mTlsHandshaker->FinishNPNSetup(false, true);
+            }
+          } else {
+            mContentBytesWritten += transactionBytes;
+          }
+        }
+      }
+    }
+
+    LOG(
+        ("nsHttpConnection::OnSocketWritable %p "
+         "ReadSegments returned [rv=%" PRIx32 " read=%u "
+         "sock-cond=%" PRIx32 " again=%d]\n",
+         this, static_cast<uint32_t>(rv), transactionBytes,
+         static_cast<uint32_t>(mSocketOutCondition), again));
+
+    // XXX some streams return NS_BASE_STREAM_CLOSED to indicate EOF.
+    if (rv == NS_BASE_STREAM_CLOSED && !mTransaction->IsDone()) {
+      rv = NS_OK;
+      transactionBytes = 0;
+    }
+
+    if (NS_FAILED(rv)) {
+      // if the transaction didn't want to write any more data, then
+      // wait for the transaction to call ResumeSend.
+      if (rv == NS_BASE_STREAM_WOULD_BLOCK) {
+        rv = NS_OK;
+      }
+      again = false;
+    } else if (NS_FAILED(mSocketOutCondition)) {
+      if (mSocketOutCondition == NS_BASE_STREAM_WOULD_BLOCK) {
+        if (!mTlsHandshaker->EarlyDataCanNotBeUsed()) {
+          // continue writing
+          // We are not going to poll for write if the handshake is in progress,
+          // but early data cannot be used.
+          rv = mSocketOut->AsyncWait(this, 0, 0, nullptr);
+        }
+      } else {
+        rv = mSocketOutCondition;
+      }
+      again = false;
+    } else if (!transactionBytes) {
+      rv = NS_OK;
+
+      if (mTransaction) {  // in case the ReadSegments stack called
+                           // CloseTransaction()
+        //
+        // at this point we've written out the entire transaction, and now we
+        // must wait for the server's response.  we manufacture a status message
+        // here to reflect the fact that we are waiting.  this message will be
+        // trumped (overwritten) if the server responds quickly.
+        //
+        mTransaction->OnTransportStatus(mSocketTransport,
+                                        NS_NET_STATUS_WAITING_FOR, 0);
+
+        rv = ResumeRecv();  // start reading
+      }
+      // When Spdy tunnel is used we need to explicitly set when a request is
+      // done.
+      if ((mState != HttpConnectionState::SETTING_UP_TUNNEL) && !mSpdySession) {
+        nsHttpTransaction* trans = mTransaction->QueryHttpTransaction();
+        // needed for websocket over h2 (direct)
+        if (!trans || !trans->IsWebsocketUpgrade()) {
+          mRequestDone = true;
+        }
+      }
+      again = false;
+    } else if (writeAttempts >= maxWriteAttempts) {
+      LOG(("  yield for other transactions\n"));
+      rv = mSocketOut->AsyncWait(this, 0, 0, nullptr);  // continue writing
+      again = false;
+    }
+    // write more to the socket until error or end-of-request...
+  } while (again && gHttpHandler->Active());
+
+  return rv;
+}
+
+nsresult nsHttpConnection::OnWriteSegment(char* buf, uint32_t count,
+                                          uint32_t* countWritten) {
+  if (count == 0) {
+    // some WriteSegments implementations will erroneously call the reader
+    // to provide 0 bytes worth of data.  we must protect against this case
+    // or else we'd end up closing the socket prematurely.
+    NS_ERROR("bad WriteSegments implementation");
+    return NS_ERROR_FAILURE;  // stop iterating
+  }
+
+  if (ChaosMode::isActive(ChaosFeature::IOAmounts) &&
+      ChaosMode::randomUint32LessThan(2)) {
+    // read 1...count bytes
+    count = ChaosMode::randomUint32LessThan(count) + 1;
+  }
+
+  nsresult rv = mSocketIn->Read(buf, count, countWritten);
+  if (NS_FAILED(rv)) {
+    mSocketInCondition = rv;
+  } else if (*countWritten == 0) {
+    mSocketInCondition = NS_BASE_STREAM_CLOSED;
+  } else {
+    mSocketInCondition = NS_OK;  // reset condition
+    mExperienceState |= ConnectionExperienceState::First_Response_Received;
+  }
+
+  return mSocketInCondition;
+}
+
+nsresult nsHttpConnection::OnSocketReadable() {
+  LOG(("nsHttpConnection::OnSocketReadable [this=%p]\n", this));
+
+  PRIntervalTime now = PR_IntervalNow();
+  PRIntervalTime delta = now - mLastReadTime;
+
+  // Reset mResponseTimeoutEnabled to stop response timeout checks.
+  mResponseTimeoutEnabled = false;
+
+  if ((mTransactionCaps & NS_HTTP_CONNECT_ONLY) && !mConnInfo->UsingConnect()) {
+    // A CONNECT has been requested for this connection but will never
+    // be performed. This should never happen.
+    MOZ_ASSERT(false, "proxy connect will never happen");
+    LOG(("return failure because proxy connect will never happen\n"));
+    return NS_ERROR_FAILURE;
+  }
+
+  if (mKeepAliveMask && (delta >= mMaxHangTime)) {
+    LOG(("max hang time exceeded!\n"));
+    // give the handler a chance to create a new persistent connection to
+    // this host if we've been busy for too long.
+    mKeepAliveMask = false;
+    Unused << gHttpHandler->ProcessPendingQ(mConnInfo);
+  }
+
+  // Reduce the estimate of the time since last read by up to 1 RTT to
+  // accommodate exhausted sender TCP congestion windows or minor I/O delays.
+  mLastReadTime = now;
+
+  nsresult rv = NS_OK;
+  uint32_t n;
+  bool again = true;
+
+  do {
+    if (!TunnelSetupInProgress() && !mTlsHandshaker->EnsureNPNComplete()) {
+      // Unless we are setting up a tunnel via CONNECT, prevent reading
+      // from the socket until the results of NPN
+      // negotiation are known (which is determined from the write path).
+      // If the server speaks SPDY it is likely the readable data here is
+      // a spdy settings frame and without NPN it would be misinterpreted
+      // as HTTP/*
+
+      LOG(
+          ("nsHttpConnection::OnSocketReadable %p return due to inactive "
+           "tunnel setup but incomplete NPN state\n",
+           this));
+      if (mTlsHandshaker->EarlyDataAvailable() || mHasTLSTransportLayer) {
+        rv = ResumeRecv();
+      }
+      break;
+    }
+
+    mSocketInCondition = NS_OK;
+    if (!mTransaction) {
+      rv = NS_ERROR_FAILURE;
+      LOG(("  No Transaction In OnSocketWritable\n"));
+    } else {
+      rv = mTransaction->WriteSegmentsAgain(
+          this, nsIOService::gDefaultSegmentSize, &n, &again);
+    }
+    LOG(("nsHttpConnection::OnSocketReadable %p trans->ws rv=%" PRIx32
+         " n=%d socketin=%" PRIx32 "\n",
+         this, static_cast<uint32_t>(rv), n,
+         static_cast<uint32_t>(mSocketInCondition)));
+    if (NS_FAILED(rv)) {
+      // if the transaction didn't want to take any more data, then
+      // wait for the transaction to call ResumeRecv.
+      if (rv == NS_BASE_STREAM_WOULD_BLOCK) {
+        rv = NS_OK;
+      }
+      again = false;
+    } else {
+      mCurrentBytesRead += n;
+      mTotalBytesRead += n;
+      if (NS_FAILED(mSocketInCondition)) {
+        // continue waiting for the socket if necessary...
+        if (mSocketInCondition == NS_BASE_STREAM_WOULD_BLOCK) {
+          rv = ResumeRecv();
+        } else {
+          rv = mSocketInCondition;
+        }
+        again = false;
+      }
+    }
+    // read more from the socket until error...
+  } while (again && gHttpHandler->Active());
+
+  return rv;
+}
+
+void nsHttpConnection::SetupSecondaryTLS() {
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+  MOZ_ASSERT(!mHasTLSTransportLayer);
+  LOG(("nsHttpConnection %p SetupSecondaryTLS %s %d\n", this,
+       mConnInfo->Origin(), mConnInfo->OriginPort()));
+
+  nsHttpConnectionInfo* ci = nullptr;
+  if (mTransaction) {
+    ci = mTransaction->ConnectionInfo();
+  }
+  if (!ci) {
+    ci = mConnInfo;
+  }
+  MOZ_ASSERT(ci);
+
+  RefPtr<TLSTransportLayer> transportLayer =
+      new TLSTransportLayer(mSocketTransport, mSocketIn, mSocketOut, this);
+  if (transportLayer->Init(ci->Origin(), ci->OriginPort())) {
+    mSocketIn = transportLayer->GetInputStreamWrapper();
+    mSocketOut = transportLayer->GetOutputStreamWrapper();
+    mSocketTransport = transportLayer;
+    mHasTLSTransportLayer = true;
+    LOG(("Create mTLSTransportLayer %p", this));
+  }
+}
+
+void nsHttpConnection::SetInSpdyTunnel() {
+  mInSpdyTunnel = true;
+  mForcePlainText = true;
+}
+
+// static
+nsresult nsHttpConnection::MakeConnectString(nsAHttpTransaction* trans,
+                                             nsHttpRequestHead* request,
+                                             nsACString& result, bool h2ws,
+                                             bool aShouldResistFingerprinting) {
+  result.Truncate();
+  if (!trans->ConnectionInfo()) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
+  DebugOnly<nsresult> rv{};
+
+  rv = nsHttpHandler::GenerateHostPort(
+      nsDependentCString(trans->ConnectionInfo()->Origin()),
+      trans->ConnectionInfo()->OriginPort(), result);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+  // CONNECT host:port HTTP/1.1
+  request->SetMethod("CONNECT"_ns);
+  request->SetVersion(gHttpHandler->HttpVersion());
+  if (h2ws) {
+    // HTTP/2 websocket CONNECT forms need the full request URI
+    nsAutoCString requestURI;
+    trans->RequestHead()->RequestURI(requestURI);
+    request->SetRequestURI(requestURI);
+
+    request->SetHTTPS(trans->RequestHead()->IsHTTPS());
+
+    nsAutoCString val;
+    if (NS_SUCCEEDED(trans->RequestHead()->GetHeader(
+            nsHttp::Sec_WebSocket_Extensions, val))) {
+      rv = request->SetHeader(nsHttp::Sec_WebSocket_Extensions, val);
+      MOZ_ASSERT(NS_SUCCEEDED(rv));
+    }
+    if (NS_SUCCEEDED(trans->RequestHead()->GetHeader(
+            nsHttp::Sec_WebSocket_Protocol, val))) {
+      rv = request->SetHeader(nsHttp::Sec_WebSocket_Protocol, val);
+      MOZ_ASSERT(NS_SUCCEEDED(rv));
+    }
+    if (NS_SUCCEEDED(trans->RequestHead()->GetHeader(
+            nsHttp::Sec_WebSocket_Version, val))) {
+      rv = request->SetHeader(nsHttp::Sec_WebSocket_Version, val);
+      MOZ_ASSERT(NS_SUCCEEDED(rv));
+    }
+  } else {
+    request->SetRequestURI(result);
+  }
+  rv = request->SetHeader(nsHttp::User_Agent,
+                          gHttpHandler->UserAgent(aShouldResistFingerprinting));
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+  // a CONNECT is always persistent
+  rv = request->SetHeader(nsHttp::Proxy_Connection, "keep-alive"_ns);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  rv = request->SetHeader(nsHttp::Connection, "keep-alive"_ns);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+  // all HTTP/1.1 requests must include a Host header (even though it
+  // may seem redundant in this case; see bug 82388).
+  rv = request->SetHeader(nsHttp::Host, result);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+
+  nsAutoCString val;
+  if (NS_SUCCEEDED(
+          trans->RequestHead()->GetHeader(nsHttp::Proxy_Authorization, val))) {
+    // we don't know for sure if this authorization is intended for the
+    // SSL proxy, so we add it just in case.
+    rv = request->SetHeader(nsHttp::Proxy_Authorization, val);
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+  }
+  if ((trans->Caps() & NS_HTTP_CONNECT_ONLY) &&
+      NS_SUCCEEDED(trans->RequestHead()->GetHeader(nsHttp::Upgrade, val))) {
+    // rfc7639 proposes using the ALPN header to indicate the protocol used
+    // in CONNECT when not used for TLS. The protocol is stored in Upgrade.
+    // We have to copy this header here since a new HEAD request is created
+    // for the CONNECT.
+    rv = request->SetHeader("ALPN"_ns, val);
+    MOZ_ASSERT(NS_SUCCEEDED(rv));
+  }
+
+  result.Truncate();
+  request->Flatten(result, false);
+
+  if (LOG1_ENABLED()) {
+    LOG(("nsHttpConnection::MakeConnectString for transaction=%p h2ws=%d[",
+         trans->QueryHttpTransaction(), h2ws));
+    LogHeaders(result.BeginReading());
+    LOG(("]"));
+  }
+
+  result.AppendLiteral("\r\n");
+  return NS_OK;
+}
+
+nsresult nsHttpConnection::StartShortLivedTCPKeepalives() {
+  if (mUsingSpdyVersion != SpdyVersion::NONE) {
+    return NS_OK;
+  }
+  MOZ_ASSERT(mSocketTransport);
+  if (!mSocketTransport) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
+  nsresult rv = NS_OK;
+  int32_t idleTimeS = -1;
+  int32_t retryIntervalS = -1;
+  if (gHttpHandler->TCPKeepaliveEnabledForShortLivedConns()) {
+    // Set the idle time.
+    idleTimeS = gHttpHandler->GetTCPKeepaliveShortLivedIdleTime();
+    LOG(
+        ("nsHttpConnection::StartShortLivedTCPKeepalives[%p] "
+         "idle time[%ds].",
+         this, idleTimeS));
+
+    retryIntervalS = std::max<int32_t>((int32_t)PR_IntervalToSeconds(mRtt), 1);
+    rv = mSocketTransport->SetKeepaliveVals(idleTimeS, retryIntervalS);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    rv = mSocketTransport->SetKeepaliveEnabled(true);
+    mTCPKeepaliveConfig = kTCPKeepaliveShortLivedConfig;
+  } else {
+    rv = mSocketTransport->SetKeepaliveEnabled(false);
+    mTCPKeepaliveConfig = kTCPKeepaliveDisabled;
+  }
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  // Start a timer to move to long-lived keepalive config.
+  if (!mTCPKeepaliveTransitionTimer) {
+    mTCPKeepaliveTransitionTimer = NS_NewTimer();
+  }
+
+  if (mTCPKeepaliveTransitionTimer) {
+    int32_t time = gHttpHandler->GetTCPKeepaliveShortLivedTime();
+
+    // Adjust |time| to ensure a full set of keepalive probes can be sent
+    // at the end of the short-lived phase.
+    if (gHttpHandler->TCPKeepaliveEnabledForShortLivedConns()) {
+      if (NS_WARN_IF(!gSocketTransportService)) {
+        return NS_ERROR_NOT_INITIALIZED;
+      }
+      int32_t probeCount = -1;
+      rv = gSocketTransportService->GetKeepaliveProbeCount(&probeCount);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+      if (NS_WARN_IF(probeCount <= 0)) {
+        return NS_ERROR_UNEXPECTED;
+      }
+      // Add time for final keepalive probes, and 2 seconds for a buffer.
+      time += ((probeCount)*retryIntervalS) - (time % idleTimeS) + 2;
+    }
+    mTCPKeepaliveTransitionTimer->InitWithNamedFuncCallback(
+        nsHttpConnection::UpdateTCPKeepalive, this, (uint32_t)time * 1000,
+        nsITimer::TYPE_ONE_SHOT,
+        "net::nsHttpConnection::StartShortLivedTCPKeepalives");
+  } else {
+    NS_WARNING(
+        "nsHttpConnection::StartShortLivedTCPKeepalives failed to "
+        "create timer.");
+  }
+
+  return NS_OK;
+}
+
+nsresult nsHttpConnection::StartLongLivedTCPKeepalives() {
+  MOZ_ASSERT(mUsingSpdyVersion == SpdyVersion::NONE,
+             "Don't use TCP Keepalive with SPDY!");
+  if (NS_WARN_IF(mUsingSpdyVersion != SpdyVersion::NONE)) {
+    return NS_OK;
+  }
+  MOZ_ASSERT(mSocketTransport);
+  if (!mSocketTransport) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
+  nsresult rv = NS_OK;
+  if (gHttpHandler->TCPKeepaliveEnabledForLongLivedConns()) {
+    // Increase the idle time.
+    int32_t idleTimeS = gHttpHandler->GetTCPKeepaliveLongLivedIdleTime();
+    LOG(("nsHttpConnection::StartLongLivedTCPKeepalives[%p] idle time[%ds]",
+         this, idleTimeS));
+
+    int32_t retryIntervalS =
+        std::max<int32_t>((int32_t)PR_IntervalToSeconds(mRtt), 1);
+    rv = mSocketTransport->SetKeepaliveVals(idleTimeS, retryIntervalS);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    // Ensure keepalive is enabled, if current status is disabled.
+    if (mTCPKeepaliveConfig == kTCPKeepaliveDisabled) {
+      rv = mSocketTransport->SetKeepaliveEnabled(true);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+    }
+    mTCPKeepaliveConfig = kTCPKeepaliveLongLivedConfig;
+  } else {
+    rv = mSocketTransport->SetKeepaliveEnabled(false);
+    mTCPKeepaliveConfig = kTCPKeepaliveDisabled;
+  }
+
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  return NS_OK;
+}
+
+nsresult nsHttpConnection::DisableTCPKeepalives() {
+  MOZ_ASSERT(mSocketTransport);
+  if (!mSocketTransport) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
+  LOG(("nsHttpConnection::DisableTCPKeepalives [%p]", this));
+  if (mTCPKeepaliveConfig != kTCPKeepaliveDisabled) {
+    nsresult rv = mSocketTransport->SetKeepaliveEnabled(false);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    mTCPKeepaliveConfig = kTCPKeepaliveDisabled;
+  }
+  if (mTCPKeepaliveTransitionTimer) {
+    mTCPKeepaliveTransitionTimer->Cancel();
+    mTCPKeepaliveTransitionTimer = nullptr;
+  }
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// nsHttpConnection::nsISupports
+//-----------------------------------------------------------------------------
+
+NS_IMPL_ADDREF(nsHttpConnection)
+NS_IMPL_RELEASE(nsHttpConnection)
+
+NS_INTERFACE_MAP_BEGIN(nsHttpConnection)
+  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
+  NS_INTERFACE_MAP_ENTRY(nsIInputStreamCallback)
+  NS_INTERFACE_MAP_ENTRY(nsIOutputStreamCallback)
+  NS_INTERFACE_MAP_ENTRY(nsITransportEventSink)
+  NS_INTERFACE_MAP_ENTRY(nsIInterfaceRequestor)
+  NS_INTERFACE_MAP_ENTRY(HttpConnectionBase)
+  NS_INTERFACE_MAP_ENTRY_CONCRETE(nsHttpConnection)
+NS_INTERFACE_MAP_END
+
+//-----------------------------------------------------------------------------
+// nsHttpConnection::nsIInputStreamCallback
+//-----------------------------------------------------------------------------
+
+// called on the socket transport thread
+NS_IMETHODIMP
+nsHttpConnection::OnInputStreamReady(nsIAsyncInputStream* in) {
+  MOZ_ASSERT(in == mSocketIn, "unexpected stream");
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+
+  if (mIdleMonitoring) {
+    MOZ_ASSERT(!mTransaction, "Idle Input Event While Active");
+
+    // The only read event that is protocol compliant for an idle connection
+    // is an EOF, which we check for with CanReuse(). If the data is
+    // something else then just ignore it and suspend checking for EOF -
+    // our normal timers or protocol stack are the place to deal with
+    // any exception logic.
+
+    if (!CanReuse()) {
+      LOG(("Server initiated close of idle conn %p\n", this));
+      Unused << gHttpHandler->ConnMgr()->CloseIdleConnection(this);
+      return NS_OK;
+    }
+
+    LOG(("Input data on idle conn %p, but not closing yet\n", this));
+    return NS_OK;
+  }
+
+  // if the transaction was dropped...
+  if (!mTransaction) {
+    LOG(("  no transaction; ignoring event\n"));
+    return NS_OK;
+  }
+
+  nsresult rv = OnSocketReadable();
+  if (rv == NS_BASE_STREAM_WOULD_BLOCK) {
+    return rv;
+  }
+
+  if (NS_FAILED(rv)) {
+    CloseTransaction(mTransaction, rv);
+  }
+
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// nsHttpConnection::nsIOutputStreamCallback
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+nsHttpConnection::OnOutputStreamReady(nsIAsyncOutputStream* out) {
+  MOZ_ASSERT(OnSocketThread(), "not on socket thread");
+  MOZ_ASSERT(out == mSocketOut, "unexpected socket");
+  // if the transaction was dropped...
+  if (!mTransaction) {
+    LOG(("  no transaction; ignoring event\n"));
+    return NS_OK;
+  }
+
+  nsresult rv = OnSocketWritable();
+  if (rv == NS_BASE_STREAM_WOULD_BLOCK) {
+    return NS_OK;
+  }
+
+  if (NS_FAILED(rv)) CloseTransaction(mTransaction, rv);
+
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// nsHttpConnection::nsITransportEventSink
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+nsHttpConnection::OnTransportStatus(nsITransport* trans, nsresult status,
+                                    int64_t progress, int64_t progressMax) {
+  if (mTransaction) mTransaction->OnTransportStatus(trans, status, progress);
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// nsHttpConnection::nsIInterfaceRequestor
+//-----------------------------------------------------------------------------
+
+// not called on the socket transport thread
+NS_IMETHODIMP
+nsHttpConnection::GetInterface(const nsIID& iid, void** result) {
+  // NOTE: This function is only called on the UI thread via sync proxy from
+  //       the socket transport thread.  If that weren't the case, then we'd
+  //       have to worry about the possibility of mTransaction going away
+  //       part-way through this function call.  See CloseTransaction.
+
+  // NOTE - there is a bug here, the call to getinterface is proxied off the
+  // nss thread, not the ui thread as the above comment says. So there is
+  // indeed a chance of mTransaction going away. bug 615342
+
+  MOZ_ASSERT(!OnSocketThread(), "on socket thread");
+
+  nsCOMPtr<nsIInterfaceRequestor> callbacks;
+  {
+    MutexAutoLock lock(mCallbacksLock);
+    callbacks = mCallbacks;
+  }
+  if (callbacks) return callbacks->GetInterface(iid, result);
+  return NS_ERROR_NO_INTERFACE;
+}
+
+void nsHttpConnection::CheckForTraffic(bool check) {
+  if (check) {
+    LOG((" CheckForTraffic conn %p\n", this));
+    if (mSpdySession) {
+      if (PR_IntervalToMilliseconds(IdleTime()) >= 500) {
+        // Send a ping to verify it is still alive if it has been idle
+        // more than half a second, the network changed events are
+        // rate-limited to one per 1000 ms.
+        LOG((" SendPing\n"));
+        mSpdySession->SendPing();
+      } else {
+        LOG((" SendPing skipped due to network activity\n"));
+      }
+    } else {
+      // If not SPDY, Store snapshot amount of data right now
+      mTrafficCount = mTotalBytesWritten + mTotalBytesRead;
+      mTrafficStamp = true;
+    }
+  } else {
+    // mark it as not checked
+    mTrafficStamp = false;
+  }
+}
+
+void nsHttpConnection::SetEvent(nsresult aStatus) {
+  switch (aStatus) {
+    case NS_NET_STATUS_RESOLVING_HOST:
+      mBootstrappedTimings.domainLookupStart = TimeStamp::Now();
+      break;
+    case NS_NET_STATUS_RESOLVED_HOST:
+      mBootstrappedTimings.domainLookupEnd = TimeStamp::Now();
+      break;
+    case NS_NET_STATUS_CONNECTING_TO:
+      mBootstrappedTimings.connectStart = TimeStamp::Now();
+      break;
+    case NS_NET_STATUS_CONNECTED_TO: {
+      TimeStamp tnow = TimeStamp::Now();
+      mBootstrappedTimings.tcpConnectEnd = tnow;
+      mBootstrappedTimings.connectEnd = tnow;
+      mBootstrappedTimings.secureConnectionStart = tnow;
+      break;
+    }
+    case NS_NET_STATUS_TLS_HANDSHAKE_STARTING:
+      mBootstrappedTimings.secureConnectionStart = TimeStamp::Now();
+      break;
+    case NS_NET_STATUS_TLS_HANDSHAKE_ENDED:
+      mBootstrappedTimings.connectEnd = TimeStamp::Now();
+      break;
+    default:
+      break;
+  }
+}
+
+bool nsHttpConnection::NoClientCertAuth() const {
+  if (!mSocketTransport) {
+    return false;
+  }
+
+  nsCOMPtr<nsITLSSocketControl> tlsSocketControl;
+  mSocketTransport->GetTlsSocketControl(getter_AddRefs(tlsSocketControl));
+  if (!tlsSocketControl) {
+    return false;
+  }
+
+  return !tlsSocketControl->GetClientCertSent();
+}
+
+WebSocketSupport nsHttpConnection::GetWebSocketSupport() {
+  LOG3(("nsHttpConnection::GetWebSocketSupport"));
+  if (!UsingSpdy()) {
+    return WebSocketSupport::SUPPORTED;
+  }
+  LOG3(("nsHttpConnection::GetWebSocketSupport checking spdy session"));
+  if (mSpdySession) {
+    return mSpdySession->GetWebSocketSupport();
+  }
+
+  return WebSocketSupport::NO_SUPPORT;
+}
+
+bool nsHttpConnection::IsProxyConnectInProgress() {
+  return mState == SETTING_UP_TUNNEL;
+}
+
+bool nsHttpConnection::LastTransactionExpectedNoContent() {
+  return mLastTransactionExpectedNoContent;
+}
+
+void nsHttpConnection::SetLastTransactionExpectedNoContent(bool val) {
+  mLastTransactionExpectedNoContent = val;
+}
+
+bool nsHttpConnection::IsPersistent() { return IsKeepAlive() && !mDontReuse; }
+
+nsAHttpTransaction* nsHttpConnection::Transaction() { return mTransaction; }
+
+nsresult nsHttpConnection::GetSelfAddr(NetAddr* addr) {
+  if (!mSocketTransport) {
+    return NS_ERROR_FAILURE;
+  }
+  return mSocketTransport->GetSelfAddr(addr);
+}
+
+nsresult nsHttpConnection::GetPeerAddr(NetAddr* addr) {
+  if (!mSocketTransport) {
+    return NS_ERROR_FAILURE;
+  }
+  return mSocketTransport->GetPeerAddr(addr);
+}
+
+bool nsHttpConnection::ResolvedByTRR() {
+  bool val = false;
+  if (mSocketTransport) {
+    mSocketTransport->ResolvedByTRR(&val);
+  }
+  return val;
+}
+
+nsIRequest::TRRMode nsHttpConnection::EffectiveTRRMode() {
+  nsIRequest::TRRMode mode = nsIRequest::TRR_DEFAULT_MODE;
+  if (mSocketTransport) {
+    mSocketTransport->GetEffectiveTRRMode(&mode);
+  }
+  return mode;
+}
+
+TRRSkippedReason nsHttpConnection::TRRSkipReason() {
+  TRRSkippedReason reason = nsITRRSkipReason::TRR_UNSET;
+  if (mSocketTransport) {
+    mSocketTransport->GetTrrSkipReason(&reason);
+  }
+  return reason;
+}
+
+bool nsHttpConnection::GetEchConfigUsed() {
+  bool val = false;
+  if (mSocketTransport) {
+    mSocketTransport->GetEchConfigUsed(&val);
+  }
+  return val;
+}
+
+void nsHttpConnection::HandshakeDoneInternal() {
+  LOG(("nsHttpConnection::HandshakeDoneInternal [this=%p]\n", this));
+  if (mTlsHandshaker->NPNComplete()) {
+    return;
+  }
+
+  ChangeConnectionState(ConnectionState::TRANSFERING);
+
+  nsCOMPtr<nsITLSSocketControl> tlsSocketControl;
+  GetTLSSocketControl(getter_AddRefs(tlsSocketControl));
+  if (!tlsSocketControl) {
+    mTlsHandshaker->FinishNPNSetup(false, false);
+    return;
+  }
+
+  nsCOMPtr<nsITransportSecurityInfo> securityInfo;
+  if (NS_FAILED(
+          tlsSocketControl->GetSecurityInfo(getter_AddRefs(securityInfo)))) {
+    mTlsHandshaker->FinishNPNSetup(false, false);
+    return;
+  }
+  if (!securityInfo) {
+    mTlsHandshaker->FinishNPNSetup(false, false);
+    return;
+  }
+
+  nsAutoCString negotiatedNPN;
+  DebugOnly<nsresult> rvDebug = securityInfo->GetNegotiatedNPN(negotiatedNPN);
+  MOZ_ASSERT(NS_SUCCEEDED(rvDebug));
+
+  bool earlyDataAccepted = false;
+  if (mTlsHandshaker->EarlyDataUsed()) {
+    // Check if early data has been accepted.
+    nsresult rvEarlyData =
+        tlsSocketControl->GetEarlyDataAccepted(&earlyDataAccepted);
+    LOG(
+        ("nsHttpConnection::HandshakeDone [this=%p] - early data "
+         "that was sent during 0RTT %s been accepted [rv=%" PRIx32 "].",
+         this, earlyDataAccepted ? "has" : "has not",
+         static_cast<uint32_t>(rvEarlyData)));
+
+    if (NS_FAILED(rvEarlyData) ||
+        (mTransaction &&
+         NS_FAILED(mTransaction->Finish0RTT(
+             !earlyDataAccepted,
+             negotiatedNPN != mTlsHandshaker->EarlyNegotiatedALPN())))) {
+      LOG(
+          ("nsHttpConection::HandshakeDone [this=%p] closing transaction "
+           "%p",
+           this, mTransaction.get()));
+      if (mTransaction) {
+        mTransaction->Close(NS_ERROR_NET_RESET);
+      }
+      mTlsHandshaker->FinishNPNSetup(false, true);
+      return;
+    }
+    if (mDid0RTTSpdy &&
+        (negotiatedNPN != mTlsHandshaker->EarlyNegotiatedALPN())) {
+      Reset0RttForSpdy();
+    }
+  }
+
+  if (mTlsHandshaker->EarlyDataAvailable() && !earlyDataAccepted) {
+    // When the early-data were used but not accepted, we need to start
+    // from the begining here and start writing the request again.
+    // The same is true if 0RTT was available but not used.
+    if (mSocketIn) {
+      mSocketIn->AsyncWait(nullptr, 0, 0, nullptr);
+    }
+    Unused << ResumeSend();
+  }
+
+  int16_t tlsVersion;
+  tlsSocketControl->GetSSLVersionUsed(&tlsVersion);
+  mConnInfo->SetLessThanTls13(
+      (tlsVersion < nsITLSSocketControl::TLS_VERSION_1_3) &&
+      (tlsVersion != nsITLSSocketControl::SSL_VERSION_UNKNOWN));
+
+  mTlsHandshaker->EarlyDataTelemetry(tlsVersion, earlyDataAccepted,
+                                     mContentBytesWritten0RTT);
+  mTlsHandshaker->EarlyDataDone();
+
+  if (!earlyDataAccepted) {
+    LOG(
+        ("nsHttpConnection::HandshakeDone [this=%p] early data not "
+         "accepted or early data were not used",
+         this));
+
+    const SpdyInformation* info = gHttpHandler->SpdyInfo();
+    if (negotiatedNPN.Equals(info->VersionString)) {
+      if (mTransaction) {
+        StartSpdy(tlsSocketControl, info->Version);
+      } else {
+        LOG(
+            ("nsHttpConnection::HandshakeDone [this=%p] set "
+             "mContinueHandshakeDone",
+             this));
+        RefPtr<nsHttpConnection> self = this;
+        mContinueHandshakeDone = [self = RefPtr{this},
+                                  tlsSocketControl(tlsSocketControl),
+                                  info(info->Version)]() {
+          LOG(("nsHttpConnection do mContinueHandshakeDone [this=%p]",
+               self.get()));
+          self->StartSpdy(tlsSocketControl, info);
+          self->mTlsHandshaker->FinishNPNSetup(true, true);
+        };
+        return;
+      }
+    }
+  } else {
+    LOG(("nsHttpConnection::HandshakeDone [this=%p] - %" PRId64 " bytes "
+         "has been sent during 0RTT.",
+         this, mContentBytesWritten0RTT));
+    mContentBytesWritten = mContentBytesWritten0RTT;
+
+    if (mSpdySession) {
+      // We had already started 0RTT-spdy, now we need to fully set up
+      // spdy, since we know we're sticking with it.
+      LOG(
+          ("nsHttpConnection::HandshakeDone [this=%p] - finishing "
+           "StartSpdy for 0rtt spdy session %p",
+           this, mSpdySession.get()));
+      StartSpdy(tlsSocketControl, mSpdySession->SpdyVersion());
+    }
+  }
+
+  Telemetry::Accumulate(Telemetry::SPDY_NPN_CONNECT, UsingSpdy());
+
+  mTlsHandshaker->FinishNPNSetup(true, true);
+  Unused << ResumeSend();
+}
+
+void nsHttpConnection::SetTunnelSetupDone() {
+  MOZ_ASSERT(mProxyConnectStream);
+  MOZ_ASSERT(mState == HttpConnectionState::SETTING_UP_TUNNEL);
+
+  ChangeState(HttpConnectionState::REQUEST);
+  mProxyConnectStream = nullptr;
+}
+
+nsresult nsHttpConnection::CheckTunnelIsNeeded() {
+  switch (mState) {
+    case HttpConnectionState::UNINITIALIZED: {
+      // This is is called first time. Check if we need a tunnel.
+      if (!mTransaction->ConnectionInfo()->UsingConnect()) {
+        ChangeState(HttpConnectionState::REQUEST);
+        return NS_OK;
+      }
+      ChangeState(HttpConnectionState::SETTING_UP_TUNNEL);
+    }
+      [[fallthrough]];
+    case HttpConnectionState::SETTING_UP_TUNNEL: {
+      // When a nsHttpConnection is in this state that means that an
+      // authentication was needed and we are resending a CONNECT
+      // request. This request will include authentication headers.
+      nsresult rv = SetupProxyConnectStream();
+      if (NS_FAILED(rv)) {
+        ChangeState(HttpConnectionState::UNINITIALIZED);
+      }
+      return rv;
+    }
+    case HttpConnectionState::REQUEST:
+      return NS_OK;
+  }
+  return NS_OK;
+}
+
+nsresult nsHttpConnection::SetupProxyConnectStream() {
+  LOG(("nsHttpConnection::SetupStream\n"));
+  NS_ENSURE_TRUE(!mProxyConnectStream, NS_ERROR_ALREADY_INITIALIZED);
+  MOZ_ASSERT(mState == HttpConnectionState::SETTING_UP_TUNNEL);
+
+  nsAutoCString buf;
+  nsHttpRequestHead request;
+  nsresult rv = MakeConnectString(mTransaction, &request, buf,
+                                  mForWebSocket && mInSpdyTunnel,
+                                  mTransactionCaps & NS_HTTP_USE_RFP);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  rv = NS_NewCStringInputStream(getter_AddRefs(mProxyConnectStream),
+                                std::move(buf));
+  return rv;
+}
+
+nsresult nsHttpConnection::ReadFromStream(nsIInputStream* input, void* closure,
+                                          const char* buf, uint32_t offset,
+                                          uint32_t count, uint32_t* countRead) {
+  // thunk for nsIInputStream instance
+  nsHttpConnection* conn = (nsHttpConnection*)closure;
+  return conn->OnReadSegment(buf, count, countRead);
+}
+
+nsresult nsHttpConnection::SendConnectRequest(void* closure,
+                                              uint32_t* transactionBytes) {
+  LOG(("  writing CONNECT request stream\n"));
+  return mProxyConnectStream->ReadSegments(ReadFromStream, closure,
+                                           nsIOService::gDefaultSegmentSize,
+                                           transactionBytes);
+}
+
+}  // namespace mozilla::net