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diff --git a/netwerk/base/TCPFastOpen.h b/netwerk/base/TCPFastOpen.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 TCPFASTOPEN_H__
+#define TCPFASTOPEN_H__
+
+/**
+ * This is an abstract class for TCP Fast Open - TFO (RFC7413).
+ * It is not always safe to use Fast Open. It can be use for requests that
+ * are replayable.
+ * Middle boxes can block or reset connections that use TFO, therefore a
+ * backup connection will be prepared with a delay.
+ * In case of blocking such a connection tcp socket will terminate only after
+ * a timeout, therefore a backup connection is needed. If connection is refuse
+ * the same socketTransport will retry.
+ *
+ * This is implemented by nsHalfopenSocket.
+ **/
+
+namespace mozilla {
+namespace net {
+
+class TCPFastOpen {
+ public:
+  // Check if we have a transaction that is safe to be used with TFO.
+  // Connections over TLS are always safe and some http requests (e.g. GET).
+  virtual bool FastOpenEnabled() = 0;
+  // To use TFO we need to have a transaction prepared, e.g. also have
+  // nsHttpConnection ready. This functions is call by nsSocketTransport to
+  // setup a connection.
+  virtual nsresult StartFastOpen() = 0;
+  // Inform nsHalfopenSocket whether a connection using TFO succeeded or not.
+  // This will cancel the backup connection and in case of a failure rewind
+  // the transaction.
+  virtual void SetFastOpenConnected(nsresult error, bool aWillRetry) = 0;
+  virtual void FastOpenNotSupported() = 0;
+  virtual void SetFastOpenStatus(uint8_t tfoStatus) = 0;
+};
+
+}  // namespace net
+}  // namespace mozilla
+
+#endif  // TCPFASTOPEN_H__