CODE EXAMPLE FOR JAVASCRIPT

how to set content length of an mp3 stream in nodejs

var http = require('http'),
    url = require('url'),
    fs   = require('fs'),
    filePath = '/home/risto/Downloads/oleg.mp4',
    stat = fs.statSync(filePath);

http.createServer(function(request, response) {        
    const fileSize = stat.size;
    const range = request.headers.range;
    if (range) {
      const parts = range.replace(/bytes=/, "").split("-");
      const start = parseInt(parts[0], 10);
      const end = parts[1] 
        ? parseInt(parts[1], 10)
        : fileSize - 1;
      const chunksize = (end - start) + 1;
      const readStream = fs.createReadStream(filePath, { start, end });
      const head = {
        'Content-Range': `bytes ${start}-${end}/${fileSize}`,
        'Accept-Ranges': 'bytes',
        'Content-Length': chunksize,
        'Content-Type': 'video/mp4',
      };
      response.writeHead(206, head);
      readStream.pipe(response);
    } else {
      const head = {
        'Content-Length': fileSize,
        'Content-Type': 'video/mp4',
      };
      response.writeHead(200, head);
      fs.createReadStream(filePath).pipe(response);
    }
})
.listen(2000);