anchor.diff:      // Build the archive.
       return archiveContainer(appContainer, true).then((List<int> archivedData) {
         monitor.worked(3);
  -      httpRequest = _buildHttpRequest('localhost', archivedData);
  +      httpRequest = _buildPushRequest('localhost', archivedData);
   
         // Send this payload to the USB code.
         return _fetchAndroidDevice();
  
positive.code:   }
  
    /**
     * Launch an app with appId on given target address.  If target is
     * null, will be sent to USB device.
     */
    List<int> _buildLaunchRequest(String appId, [String target = null]) {
      List<int> httpRequest = [];
      // Build the HTTP request headers.
      String header =
          'POST /launch HTTP/1.1\r\n'
          'User-Agent: Spark IDE\r\n';
      String body = "appId=$appId";
  
      httpRequest.addAll(header.codeUnits);
      httpRequest.addAll('Content-length: ${body.length}\r\n\r\n'.codeUnits);
      httpRequest.addAll(body.codeUnits);
  
      return httpRequest;
    }
  
    List<int> _buildHttpRequest(String target, List<int> payload) {
      List<int> httpRequest = [];
      // Build the HTTP request headers.
      String header =
          'POST /zippush?appId=${appContainer.project.name}&appType=chrome HTTP/1.1\r\n'
          'User-Agent: Spark IDE\r\n'
          'Host: ${target}:2424\r\n';
      List<int> body = [];
  
      // Add the CRX headers before the zip content.
      // This is the string "Cr24" then three little-endian 32-bit numbers:
      // - The version (2).
      // - The public key length (0).
      // - The signature length (0).
      // Since the App Dev Tool on the other end doesn't check
      // the signature or key, we don't bother sending them.
  
      // Now follows the actual zip data.
      body.addAll(payload);
      httpRequest.addAll(header.codeUnits);
      httpRequest.addAll('Content-length: ${body.length}\r\n\r\n'.codeUnits);
      httpRequest.addAll(body);
  
      return httpRequest;
    }
  
    Future _sendTcpRequest(String target, List<int> httpRequest) {
  
negative.code:   Future _sendHttpPush(String target, ProgressMonitor monitor) {
      return archiveContainer(appContainer, true).then((List<int> archivedData) {
        monitor.worked(3);
        return _sendTcpRequest(target, _buildPushRequest(target, archivedData));
      }).then((List<int> responseBytes) {
        String response = new String.fromCharCodes(responseBytes);
        List<String> lines = response.split('\n');
  