app.get('/createFile', (req, res) => {
    var fs = require("fs");

    var writeStream = fs.createWriteStream("./data/dynamic_file.txt");
    writeStream.write("Hi,  Users. I am generated after the /createFile get request. ");
    writeStream.write("Thank You.");
    writeStream.end();

    res.send('File is generated. Click <a href="/resources/dynamic_file.txt"> here </a> to see the file. Save/download the file using ctrl+s');
});