temp

working.js

// client
    function tts(text) {
        var url = 'http://localhost:8080/nlc/synthesize';
        var req = {
            method: 'POST',
            url: url,
            responseType: 'blob',
            data: {
                "text": text
            },
            headers: {
                'Content-Type': 'application/json',
            }
        }

        $http(req).then(function(response) {
            console.log(response);
            audio.pause();
            audio.src = URL.createObjectURL(response.data);
            audio.play();
        })
    };
    
//server:
app.post('/nlc/synthesize', function(req, res, next) {
  if (req.body.text == "When shall we meet again?") {
      var transcript = textToSpeech.synthesize({
          voice: 'en-US_AllisonVoice',
          text: "In thunder, darkness or in rain. When the hurlyburly's done, when the batlle's lost, and won."
      });
      transcript.pipe(res);
  } else {
      var text = req.body.text;
      var deviceId = "node-red";

      dlg.classify(deviceId, text, function(err, result) {

          console.log(result);

          var transcript = textToSpeech.synthesize({
              voice: 'en-US_AllisonVoice',
              text: result
          });
          transcript.pipe(res);
      });
  }

});