node/test/simple/test-http-byteswritten.js

// Copyright Joyent, Inc. and other Node contributors.
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// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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var common = require('../common');
var assert = require('assert');
var fs = require('fs');
var http = require('http');

var body = 'hello world\n';

var httpServer = http.createServer(function(req, res) {
  res.on('finish', function() {
    assert(typeof(req.connection.bytesWritten) === 'number');
    assert(req.connection.bytesWritten > 0);
    httpServer.close();
    console.log('ok');
  });
  res.writeHead(200, { 'Content-Type': 'text/plain' });

  // Write 1.5mb to cause some requests to buffer
  // Also, mix up the encodings a bit.
  var chunk = new Array(1024 + 1).join('7');
  var bchunk = new Buffer(chunk);
  for (var i = 0; i < 1024; i++) {
    res.write(chunk);
    res.write(bchunk);
    res.write(chunk, 'hex');
  }
  // Get .bytesWritten while buffer is not empty
  assert(res.connection.bytesWritten > 0);

  res.end(body);
});

httpServer.listen(common.PORT, function() {
  http.get({ port: common.PORT });
});