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diff --git a/testing/xpcshell/node-http2/lib/protocol/endpoint.js b/testing/xpcshell/node-http2/lib/protocol/endpoint.js
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+var assert = require('assert');
+
+var Serializer   = require('./framer').Serializer;
+var Deserializer = require('./framer').Deserializer;
+var Compressor   = require('./compressor').Compressor;
+var Decompressor = require('./compressor').Decompressor;
+var Connection   = require('./connection').Connection;
+var Duplex       = require('stream').Duplex;
+var Transform    = require('stream').Transform;
+
+exports.Endpoint = Endpoint;
+
+// The Endpoint class
+// ==================
+
+// Public API
+// ----------
+
+// - **new Endpoint(log, role, settings, filters)**: create a new Endpoint.
+//
+//   - `log`: bunyan logger of the parent
+//   - `role`: 'CLIENT' or 'SERVER'
+//   - `settings`: initial HTTP/2 settings
+//   - `filters`: a map of functions that filter the traffic between components (for debugging or
+//     intentional failure injection).
+//
+//     Filter functions get three arguments:
+//     1. `frame`: the current frame
+//     2. `forward(frame)`: function that can be used to forward a frame to the next component
+//     3. `done()`: callback to signal the end of the filter process
+//
+//     Valid filter names and their position in the stack:
+//     - `beforeSerialization`: after compression, before serialization
+//     - `beforeCompression`: after multiplexing, before compression
+//     - `afterDeserialization`: after deserialization, before decompression
+//     - `afterDecompression`: after decompression, before multiplexing
+//
+// * **Event: 'stream' (Stream)**: 'stream' event forwarded from the underlying Connection
+//
+// * **Event: 'error' (type)**: signals an error
+//
+// * **createStream(): Stream**: initiate a new stream (forwarded to the underlying Connection)
+//
+// * **close([error])**: close the connection with an error code
+
+// Constructor
+// -----------
+
+// The process of initialization:
+function Endpoint(log, role, settings, filters) {
+  Duplex.call(this);
+
+  // * Initializing logging infrastructure
+  this._log = log.child({ component: 'endpoint', e: this });
+
+  // * First part of the handshake process: sending and receiving the client connection header
+  //   prelude.
+  assert((role === 'CLIENT') || role === 'SERVER');
+  if (role === 'CLIENT') {
+    this._writePrelude();
+  } else {
+    this._readPrelude();
+  }
+
+  // * Initialization of component. This includes the second part of the handshake process:
+  //   sending the first SETTINGS frame. This is done by the connection class right after
+  //   initialization.
+  this._initializeDataFlow(role, settings, filters || {});
+
+  // * Initialization of management code.
+  this._initializeManagement();
+
+  // * Initializing error handling.
+  this._initializeErrorHandling();
+}
+Endpoint.prototype = Object.create(Duplex.prototype, { constructor: { value: Endpoint } });
+
+// Handshake
+// ---------
+
+var CLIENT_PRELUDE = Buffer.from('PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n');
+
+// Writing the client header is simple and synchronous.
+Endpoint.prototype._writePrelude = function _writePrelude() {
+  this._log.debug('Sending the client connection header prelude.');
+  this.push(CLIENT_PRELUDE);
+};
+
+// The asynchronous process of reading the client header:
+Endpoint.prototype._readPrelude = function _readPrelude() {
+  // * progress in the header is tracker using a `cursor`
+  var cursor = 0;
+
+  // * `_write` is temporarily replaced by the comparator function
+  this._write = function _temporalWrite(chunk, encoding, done) {
+    // * which compares the stored header with the current `chunk` byte by byte and emits the
+    //   'error' event if there's a byte that doesn't match
+    var offset = cursor;
+    while(cursor < CLIENT_PRELUDE.length && (cursor - offset) < chunk.length) {
+      if (CLIENT_PRELUDE[cursor] !== chunk[cursor - offset]) {
+        this._log.fatal({ cursor: cursor, offset: offset, chunk: chunk },
+                        'Client connection header prelude does not match.');
+        this._error('handshake', 'PROTOCOL_ERROR');
+        return;
+      }
+      cursor += 1;
+    }
+
+    // * if the whole header is over, and there were no error then restore the original `_write`
+    //   and call it with the remaining part of the current chunk
+    if (cursor === CLIENT_PRELUDE.length) {
+      this._log.debug('Successfully received the client connection header prelude.');
+      delete this._write;
+      chunk = chunk.slice(cursor - offset);
+      this._write(chunk, encoding, done);
+    }
+  };
+};
+
+// Data flow
+// ---------
+
+//     +---------------------------------------------+
+//     |                                             |
+//     |   +-------------------------------------+   |
+//     |   | +---------+ +---------+ +---------+ |   |
+//     |   | | stream1 | | stream2 | |   ...   | |   |
+//     |   | +---------+ +---------+ +---------+ |   |
+//     |   |             connection              |   |
+//     |   +-------------------------------------+   |
+//     |             |                 ^             |
+//     |        pipe |                 | pipe        |
+//     |             v                 |             |
+//     |   +------------------+------------------+   |
+//     |   |    compressor    |   decompressor   |   |
+//     |   +------------------+------------------+   |
+//     |             |                 ^             |
+//     |        pipe |                 | pipe        |
+//     |             v                 |             |
+//     |   +------------------+------------------+   |
+//     |   |    serializer    |   deserializer   |   |
+//     |   +------------------+------------------+   |
+//     |             |                 ^             |
+//     |     _read() |                 | _write()    |
+//     |             v                 |             |
+//     |      +------------+     +-----------+       |
+//     |      |output queue|     |input queue|       |
+//     +------+------------+-----+-----------+-------+
+//                   |                 ^
+//            read() |                 | write()
+//                   v                 |
+
+function createTransformStream(filter) {
+  var transform = new Transform({ objectMode: true });
+  var push = transform.push.bind(transform);
+  transform._transform = function(frame, encoding, done) {
+    filter(frame, push, done);
+  };
+  return transform;
+}
+
+function pipeAndFilter(stream1, stream2, filter) {
+  if (filter) {
+    stream1.pipe(createTransformStream(filter)).pipe(stream2);
+  } else {
+    stream1.pipe(stream2);
+  }
+}
+
+Endpoint.prototype._initializeDataFlow = function _initializeDataFlow(role, settings, filters) {
+  var firstStreamId, compressorRole, decompressorRole;
+  if (role === 'CLIENT') {
+    firstStreamId = 1;
+    compressorRole = 'REQUEST';
+    decompressorRole = 'RESPONSE';
+  } else {
+    firstStreamId = 2;
+    compressorRole = 'RESPONSE';
+    decompressorRole = 'REQUEST';
+  }
+
+  this._serializer   = new Serializer(this._log);
+  this._deserializer = new Deserializer(this._log);
+  this._compressor   = new Compressor(this._log, compressorRole);
+  this._decompressor = new Decompressor(this._log, decompressorRole);
+  this._connection   = new Connection(this._log, firstStreamId, settings);
+
+  pipeAndFilter(this._connection, this._compressor, filters.beforeCompression);
+  pipeAndFilter(this._compressor, this._serializer, filters.beforeSerialization);
+  pipeAndFilter(this._deserializer, this._decompressor, filters.afterDeserialization);
+  pipeAndFilter(this._decompressor, this._connection, filters.afterDecompression);
+
+  this._connection.on('ACKNOWLEDGED_SETTINGS_HEADER_TABLE_SIZE',
+                      this._decompressor.setTableSizeLimit.bind(this._decompressor));
+  this._connection.on('RECEIVING_SETTINGS_HEADER_TABLE_SIZE',
+                      this._compressor.setTableSizeLimit.bind(this._compressor));
+};
+
+var noread = {};
+Endpoint.prototype._read = function _read() {
+  this._readableState.sync = true;
+  var moreNeeded = noread, chunk;
+  while (moreNeeded && (chunk = this._serializer.read())) {
+    moreNeeded = this.push(chunk);
+  }
+  if (moreNeeded === noread) {
+    this._serializer.once('readable', this._read.bind(this));
+  }
+  this._readableState.sync = false;
+};
+
+Endpoint.prototype._write = function _write(chunk, encoding, done) {
+  this._deserializer.write(chunk, encoding, done);
+};
+
+// Management
+// --------------
+
+Endpoint.prototype._initializeManagement = function _initializeManagement() {
+  this._connection.on('stream', this.emit.bind(this, 'stream'));
+};
+
+Endpoint.prototype.createStream = function createStream() {
+  return this._connection.createStream();
+};
+
+// Error handling
+// --------------
+
+Endpoint.prototype._initializeErrorHandling = function _initializeErrorHandling() {
+  this._serializer.on('error', this._error.bind(this, 'serializer'));
+  this._deserializer.on('error', this._error.bind(this, 'deserializer'));
+  this._compressor.on('error', this._error.bind(this, 'compressor'));
+  this._decompressor.on('error', this._error.bind(this, 'decompressor'));
+  this._connection.on('error', this._error.bind(this, 'connection'));
+
+  this._connection.on('peerError', this.emit.bind(this, 'peerError'));
+};
+
+Endpoint.prototype._error = function _error(component, error) {
+  this._log.fatal({ source: component, message: error }, 'Fatal error, closing connection');
+  this.close(error);
+  setImmediate(this.emit.bind(this, 'error', error));
+};
+
+Endpoint.prototype.close = function close(error) {
+  this._connection.close(error);
+};
+
+// Bunyan serializers
+// ------------------
+
+exports.serializers = {};
+
+var nextId = 0;
+exports.serializers.e = function(endpoint) {
+  if (!('id' in endpoint)) {
+    endpoint.id = nextId;
+    nextId += 1;
+  }
+  return endpoint.id;
+};