Pipe complete function not called

Dear community,

I tried to pipe an http response directly to a file to save RAM. I experienced that sometimes the file contains the right content, sometimes it contains strange characters. Furthermore the "complete" function defined in the pipe options is never getting called.

I formatted the SD card before I tested and I typed E.unmountSD() to be sure that it is not a problem with the SD card filesystem.

Could you please help me? Below you find the function.

Best,

Tobias

var downloadFile = function(path, filePath) {
    var file = E.openFile(filePath, 'w');
    var body = "";
    var options = {
        method: 'GET',
        host: '192.168.0.11',
        port: 3000,
        path: path,
        headers: {
            "Content-Type": "application/json",
            "Content-Length": body.length
        }
    };
    var req = require('http').request(options, function(res) {
      res.pipe(file, { chunkSize : 32, end: true, complete: function() { console.log('Complete'); } });
      res.on('close', function() {
        console.log('Closed.');
      });
    });
    req.write(body);
    req.end();
};