Pass custom headers using request module

I am using npm request module (https://www.npmjs.com/package/request) to post binary content to a servlet. The binary content is received as part of http request, using the npm request module it is then posted to the J2ee server.

Along with the post, I need to pass some custom headers. I am using the below code to do that

var req = require('request');
function upload(request, response) {
    var options = {
      headers: {
        'customheader1': 'val1',
        'customheader2': 'val2'
      }
    };

    var target = req.post('http://'+host+':'+port+'/myapp/Upload', options);
    request.pipe(target);

    target.on('finish', function() {
        console.log('Uploaded with headers');
    })
}

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However, the headers are going as blank to the server. What would be the right way to pass headers using request.post?