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diff --git a/netwerk/protocol/http/Http3Session.h b/netwerk/protocol/http/Http3Session.h
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+++ b/netwerk/protocol/http/Http3Session.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=4 sw=2 et cindent: */
+/* 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/. */
+
+#ifndef Http3Session_H__
+#define Http3Session_H__
+
+#include "HttpTrafficAnalyzer.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/WeakPtr.h"
+#include "mozilla/net/NeqoHttp3Conn.h"
+#include "nsAHttpConnection.h"
+#include "nsDeque.h"
+#include "nsISupportsImpl.h"
+#include "nsITimer.h"
+#include "nsIUDPSocket.h"
+#include "nsRefPtrHashtable.h"
+#include "nsTHashMap.h"
+#include "nsWeakReference.h"
+
+/*
+ * WebTransport
+ *
+ * Http3Session and the underlying neqo code support multiplexing of multiple
+ * WebTransport and multiplexing WebTransport sessions with regular HTTP
+ * traffic. Whether WebTransport sessions are polled, will be controlled by the
+ * nsHttpConnectionMgr.
+ *
+ * WebTransport support is negotiated using HTTP/3 setting. Before the settings
+ * are available all WebTransport transactions are queued in
+ * mWaitingForWebTransportNegotiation. The information on whether WebTransport
+ * is supported is received via an HTTP/3 event. The event is
+ * Http3Event::Tag::WebTransport  with the value
+ * WebTransportEventExternal::Tag::Negotiated  that can be true or false. If
+ * the WebTransport feature has been negotiated, queued transactions will be
+ * activated otherwise they will be canceled(i.e. WebTransportNegotiationDone).
+ *
+ * The lifetime of a WebTransport session
+ *
+ * A WebTransport lifetime consists of 2 parts:
+ * - WebTransport session setup
+ * - WebTransport session active time
+ *
+ * WebTransport session setup:
+ * A WebTransport session uses a regular HTTP request for negotiation.
+ * Therefore when a new WebTransport is started a nsHttpChannel and the
+ * corresponding nsHttpTransaction are created. The nsHttpTransaction is
+ * dispatched to a Http3Session and after the
+ * WebTransportEventExternal::Tag::Negotiated event it behaves almost the same
+ * as a regular transaction, e.g. it is added to mStreamTransactionHash and
+ * mStreamIdHash. For activating the session NeqoHttp3Conn::CreateWebTransport
+ * is  called instead of NeqoHttp3Conn::Fetch(this is called for the regular
+ * HTTP requests). In this phase, the WebTransport session is canceled in the
+ * same way a regular request is canceled, by canceling the corresponding
+ * nsHttpChannel. If HTTP/3 connection is closed in this phase the
+ * corresponding nsHttpTransaction is canceled and this may cause the
+ * transaction to be restarted (this is the existing restart logic) or the
+ * error is propagated to the nsHttpChannel and its listener(via OnStartRequest
+ * and OnStopRequest as the regular HTTP request).
+ * The phase ends when a connection breaks or when the event
+ * Http3Event::Tag::WebTransport with the value
+ * WebTransportEventExternal::Tag::Session is received. The parameter
+ * aData(from NeqoHttp3Conn::GetEvent) contain the HTTP head of the response.
+ * The headers may be:
+ * - failed code, i.e. anything except 200. In this case, the nsHttpTransaction
+ *   behaves the same as a normal HTTP request and the nsHttpChannel listener
+ *   will be informed via OnStartRequest and OnStopRequest calls.
+ * - success code, i.e. 200. The code will be propagated to the
+ *   nsHttpTransaction. The transaction will parse the header and call
+ *   Http3Session::GetWebTransportSession. The function transfers WebTransport
+ *   session into the next phase:
+ *   - Removes nsHttpTransaction from mStreamTransactionHash.
+ *   - Adds the stream to mWebTransportSessions
+ *   - The nsHttpTransaction supplies Http3WebTransportSession to the
+ *     WebTransportSessionProxy and vice versa.
+ *     TODO remove this circular referencing.
+ *
+ * WebTransport session active time:
+ * During this phase the following actions are possible:
+ * - Cancelling a WebTransport session by the application:
+ *   The application calls Http3WebTransportSession::CloseSession. This
+ *   transfers Http3WebTransportSession into the CLOSE_PENDING state and calls
+ *   Http3Session::ConnectSlowConsumer to add itself to the “ready for reading
+ *   queue”. Consequently, the Http3Session will call
+ *   Http3WebTransportSession::WriteSegments and
+ *   Http3Session::CloseWebTransport will be called to send the closing signal
+ *   to the peer. After this, the Http3WebTransportSession is in the state DONE
+ *   and it will be removed from the Http3Session(the CloseStream function
+ *   takes care of this).
+ * - The peer sending a session closing signal:
+ *   Http3Session will receive a Http3Event::Tag::WebTransport event with value
+ *   WebTransportEventExternal::Tag::SessionClosed. The
+ *   Http3WebTransportSession::OnSessionClosed function for the corresponding
+ *   stream wil be called. The function will inform the corresponding
+ *   WebTransportSessionProxy by calling OnSessionClosed function. The
+ *   Http3WebTransportSession is in the state DONE and will be removed from the
+ *   Http3Session(the CloseStream function takes care of this).
+ */
+
+namespace mozilla::net {
+
+class HttpConnectionUDP;
+class Http3StreamBase;
+class QuicSocketControl;
+
+// IID for the Http3Session interface
+#define NS_HTTP3SESSION_IID                          \
+  {                                                  \
+    0x8fc82aaf, 0xc4ef, 0x46ed, {                    \
+      0x89, 0x41, 0x93, 0x95, 0x8f, 0xac, 0x4f, 0x21 \
+    }                                                \
+  }
+
+enum class EchExtensionStatus {
+  kNotPresent,  // No ECH Extension was sent
+  kGREASE,      // A GREASE ECH Extension was sent
+  kReal         // A 'real' ECH Extension was sent
+};
+
+class Http3Session final : public nsAHttpTransaction, public nsAHttpConnection {
+ public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_HTTP3SESSION_IID)
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSAHTTPTRANSACTION
+  NS_DECL_NSAHTTPCONNECTION(mConnection)
+
+  Http3Session();
+  nsresult Init(const nsHttpConnectionInfo* aConnInfo, nsINetAddr* selfAddr,
+                nsINetAddr* peerAddr, HttpConnectionUDP* udpConn,
+                uint32_t controlFlags, nsIInterfaceRequestor* callbacks);
+
+  bool IsConnected() const { return mState == CONNECTED; }
+  bool CanSandData() const {
+    return (mState == CONNECTED) || (mState == ZERORTT);
+  }
+  bool IsClosing() const { return (mState == CLOSING || mState == CLOSED); }
+  bool IsClosed() const { return mState == CLOSED; }
+
+  bool AddStream(nsAHttpTransaction* aHttpTransaction, int32_t aPriority,
+                 nsIInterfaceRequestor* aCallbacks);
+
+  bool CanReuse();
+
+  // The following functions are used by Http3Stream and
+  // Http3WebTransportSession:
+  nsresult TryActivating(const nsACString& aMethod, const nsACString& aScheme,
+                         const nsACString& aAuthorityHeader,
+                         const nsACString& aPath, const nsACString& aHeaders,
+                         uint64_t* aStreamId, Http3StreamBase* aStream);
+  // The folowing functions are used by Http3Stream:
+  void CloseSendingSide(uint64_t aStreamId);
+  nsresult SendRequestBody(uint64_t aStreamId, const char* buf, uint32_t count,
+                           uint32_t* countRead);
+  nsresult ReadResponseHeaders(uint64_t aStreamId,
+                               nsTArray<uint8_t>& aResponseHeaders, bool* aFin);
+  nsresult ReadResponseData(uint64_t aStreamId, char* aBuf, uint32_t aCount,
+                            uint32_t* aCountWritten, bool* aFin);
+
+  // The folowing functions are used by Http3WebTransportSession:
+  nsresult CloseWebTransport(uint64_t aSessionId, uint32_t aError,
+                             const nsACString& aMessage);
+  nsresult CreateWebTransportStream(uint64_t aSessionId,
+                                    WebTransportStreamType aStreamType,
+                                    uint64_t* aStreamId);
+  void CloseStream(Http3StreamBase* aStream, nsresult aResult);
+  void CloseStreamInternal(Http3StreamBase* aStream, nsresult aResult);
+
+  void SetCleanShutdown(bool aCleanShutdown) {
+    mCleanShutdown = aCleanShutdown;
+  }
+
+  bool TestJoinConnection(const nsACString& hostname, int32_t port);
+  bool JoinConnection(const nsACString& hostname, int32_t port);
+
+  void TransactionHasDataToWrite(nsAHttpTransaction* caller) override;
+  void TransactionHasDataToRecv(nsAHttpTransaction* caller) override;
+  [[nodiscard]] nsresult GetTransactionTLSSocketControl(
+      nsITLSSocketControl**) override;
+
+  // This function will be called by QuicSocketControl when the certificate
+  // verification is done.
+  void Authenticated(int32_t aError);
+
+  nsresult ProcessOutputAndEvents(nsIUDPSocket* socket);
+
+  void ReportHttp3Connection();
+
+  int64_t GetBytesWritten() { return mTotalBytesWritten; }
+  int64_t BytesRead() { return mTotalBytesRead; }
+
+  nsresult SendData(nsIUDPSocket* socket);
+  nsresult RecvData(nsIUDPSocket* socket);
+
+  void DoSetEchConfig(const nsACString& aEchConfig);
+
+  nsresult SendPriorityUpdateFrame(uint64_t aStreamId, uint8_t aPriorityUrgency,
+                                   bool aPriorityIncremental);
+
+  void ConnectSlowConsumer(Http3StreamBase* stream);
+
+  nsresult TryActivatingWebTransportStream(uint64_t* aStreamId,
+                                           Http3StreamBase* aStream);
+  void CloseWebTransportStream(Http3WebTransportStream* aStream,
+                               nsresult aResult);
+  void StreamHasDataToWrite(Http3StreamBase* aStream);
+  void ResetWebTransportStream(Http3WebTransportStream* aStream,
+                               uint64_t aErrorCode);
+  void StreamStopSending(Http3WebTransportStream* aStream, uint8_t aErrorCode);
+
+  void SendDatagram(Http3WebTransportSession* aSession,
+                    nsTArray<uint8_t>& aData, uint64_t aTrackingId);
+
+  uint64_t MaxDatagramSize(uint64_t aSessionId);
+
+  void CloseWebTransportConn();
+
+ private:
+  ~Http3Session();
+
+  void CloseInternal(bool aCallNeqoClose);
+  void Shutdown();
+
+  bool RealJoinConnection(const nsACString& hostname, int32_t port,
+                          bool justKidding);
+
+  nsresult ProcessOutput(nsIUDPSocket* socket);
+  void ProcessInput(nsIUDPSocket* socket);
+  nsresult ProcessEvents();
+
+  nsresult ProcessTransactionRead(uint64_t stream_id);
+  nsresult ProcessTransactionRead(Http3StreamBase* stream);
+  nsresult ProcessSlowConsumers();
+
+  void SetupTimer(uint64_t aTimeout);
+
+  enum ResetType {
+    RESET,
+    STOP_SENDING,
+  };
+  void ResetOrStopSendingRecvd(uint64_t aStreamId, uint64_t aError,
+                               ResetType aType);
+
+  void QueueStream(Http3StreamBase* stream);
+  void RemoveStreamFromQueues(Http3StreamBase*);
+  void ProcessPending();
+
+  void CallCertVerification(Maybe<nsCString> aEchPublicName);
+  void SetSecInfo();
+
+  void EchOutcomeTelemetry();
+
+  void StreamReadyToWrite(Http3StreamBase* aStream);
+  void MaybeResumeSend();
+
+  void CloseConnectionTelemetry(CloseError& aError, bool aClosing);
+  void Finish0Rtt(bool aRestart);
+
+  enum ZeroRttOutcome {
+    NOT_USED,
+    USED_SUCCEEDED,
+    USED_REJECTED,
+    USED_CONN_ERROR,
+    USED_CONN_CLOSED_BY_NECKO
+  };
+  void ZeroRttTelemetry(ZeroRttOutcome aOutcome);
+
+  RefPtr<NeqoHttp3Conn> mHttp3Connection;
+  RefPtr<nsAHttpConnection> mConnection;
+  // We need an extra map to store the mapping of WebTransportSession and
+  // WebTransportStreams to handle the case that a stream is already removed
+  // from mStreamIdHash and we still need the WebTransportSession.
+  nsTHashMap<nsUint64HashKey, uint64_t> mWebTransportStreamToSessionMap;
+  nsRefPtrHashtable<nsUint64HashKey, Http3StreamBase> mStreamIdHash;
+  nsRefPtrHashtable<nsPtrHashKey<nsAHttpTransaction>, Http3StreamBase>
+      mStreamTransactionHash;
+
+  nsRefPtrDeque<Http3StreamBase> mReadyForWrite;
+  nsTArray<RefPtr<Http3StreamBase>> mSlowConsumersReadyForRead;
+  nsRefPtrDeque<Http3StreamBase> mQueuedStreams;
+
+  enum State {
+    INITIALIZING,
+    ZERORTT,
+    CONNECTED,
+    CLOSING,
+    CLOSED
+  } mState{INITIALIZING};
+
+  bool mAuthenticationStarted{false};
+  bool mCleanShutdown{false};
+  bool mGoawayReceived{false};
+  bool mShouldClose{false};
+  bool mIsClosedByNeqo{false};
+  bool mHttp3ConnectionReported = false;
+  // mError is neqo error (a protocol error) and that may mean that we will
+  // send some packets after that.
+  nsresult mError{NS_OK};
+  // This is a socket error, there is no poioint in sending anything on that
+  // socket.
+  nsresult mSocketError{NS_OK};
+  bool mBeforeConnectedError{false};
+  uint64_t mCurrentBrowserId;
+
+  // True if the mTimer is inited and waiting for firing.
+  bool mTimerActive{false};
+
+  RefPtr<HttpConnectionUDP> mUdpConn;
+
+  // The underlying socket transport object is needed to propogate some events
+  RefPtr<nsISocketTransport> mSocketTransport;
+
+  nsCOMPtr<nsITimer> mTimer;
+
+  nsTHashMap<nsCStringHashKey, bool> mJoinConnectionCache;
+
+  RefPtr<QuicSocketControl> mSocketControl;
+
+  uint64_t mTransactionCount = 0;
+
+  // The stream(s) that we are getting 0RTT data from.
+  nsTArray<WeakPtr<Http3StreamBase>> m0RTTStreams;
+  // The stream(s) that are not able to send 0RTT data. We need to
+  // remember them put them into mReadyForWrite queue when 0RTT finishes.
+  nsTArray<WeakPtr<Http3StreamBase>> mCannotDo0RTTStreams;
+
+  // The following variables are needed for telemetry.
+  TimeStamp mConnectionIdleStart;
+  TimeStamp mConnectionIdleEnd;
+  Maybe<uint64_t> mFirstStreamIdReuseIdleConnection;
+  TimeStamp mTimerShouldTrigger;
+  TimeStamp mZeroRttStarted;
+  uint64_t mBlockedByStreamLimitCount = 0;
+  uint64_t mTransactionsBlockedByStreamLimitCount = 0;
+  uint64_t mTransactionsSenderBlockedByFlowControlCount = 0;
+
+  // NS_NET_STATUS_CONNECTED_TO event will be created by the Http3Session.
+  // We want to  propagate it to the first transaction.
+  RefPtr<nsHttpTransaction> mFirstHttpTransaction;
+
+  RefPtr<nsHttpConnectionInfo> mConnInfo;
+
+  bool mThroughCaptivePortal = false;
+  int64_t mTotalBytesRead = 0;     // total data read
+  int64_t mTotalBytesWritten = 0;  // total data read
+  PRIntervalTime mLastWriteTime = 0;
+
+  // Records whether we sent an ECH Extension and whether it was a GREASE Xtn
+  EchExtensionStatus mEchExtensionStatus = EchExtensionStatus::kNotPresent;
+
+  // Records whether the handshake finished successfully and we established a
+  // a connection.
+  bool mHandshakeSucceeded = false;
+
+  nsCOMPtr<nsINetAddr> mNetAddr;
+
+  enum WebTransportNegotiation { DISABLED, NEGOTIATING, FAILED, SUCCEEDED };
+  WebTransportNegotiation mWebTransportNegotiationStatus{
+      WebTransportNegotiation::DISABLED};
+
+  nsTArray<WeakPtr<Http3StreamBase>> mWaitingForWebTransportNegotiation;
+  // 1795854 implement the case when WebTransport is not supported.
+  // Also, implement the case when the  HTTP/3 session fails before settings
+  // are exchanged.
+  void WebTransportNegotiationDone();
+
+  nsTArray<RefPtr<Http3StreamBase>> mWebTransportSessions;
+  nsTArray<RefPtr<Http3StreamBase>> mWebTransportStreams;
+
+  bool mHasWebTransportSession = false;
+  // When true, we don't add this connection info into the Http/3 excluded list.
+  bool mDontExclude = false;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(Http3Session, NS_HTTP3SESSION_IID);
+
+}  // namespace mozilla::net
+
+#endif  // Http3Session_H__