title: Getting "first argument must be a string or Buffer" error
body: <pre><code>// call the packages
  var express = require('express');
  var app = express();
  var bodyParser = require('body-parser');
  var figlet = require('figlet');
  var querystring = require('querystring');
  var http = require('http');
  var fs = require('fs');
  var request = require('request');
  
  // configure app to use bodyParser()
  // this will let app get the data from a POST
  app.use(bodyParser.urlencoded({
      extended: true
  }));
  app.use(bodyParser.text());
  
  // set port
  var port = process.env.PORT || 8082;
  
  // get an instance of the express Router
  var router = express.Router();
  
  
  // middleware to use for all requests
  router.use(function(req, res, next) {
  
      // do logging
      console.log('UnitGener router invoking');
      // go to the next routes and don't stop here
      next();
  });
  
  // test route to make sure everything is working (accessed at GET http://localhost:8082/api)
  router.get('/status', function(req, res) {
      res.json({
          message: 'UnitGener is ready to work!'
      });
  });
  
  
  //noinspection JSUnresolvedFunction
  router.route('/function')
  
      .post(function(req, res) {
          console.log(req.body);
          var formatted = req.body;
  
  
          request.post({
              headers: {
                  'content-type': 'application/x-www-form-urlencoded'
              },
              url: 'http://localhost:5000/generate',
              body: formatted
          }, function(error, response, body) {
              console.log(body);
          });
  
      });
  
  app.use('/api', router);
  app.listen(port);
  });
  </code></pre>
  
  <p>Here is my complete code for creating a POST route with the given configs and then I am calling another post route within the post method. But I am getting the "throw new TypeError('first argument must be a string or Buffer');" this error. I did some google finding and did some changes also , non of them worked and still find it hard to point the error. I changed the body:    formatted to body:    formatted.toString() also but didn't work. Please give me some advice to find this out. Its a huge help for me. </p>
  
  <p>Thanks in Advance</p>