node/test/simple/test-http-server-multiheaders.js

// Copyright Joyent, Inc. and other Node contributors.
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// Verify that the HTTP server implementation handles multiple instances
// of the same header as per RFC2616: joining the handful of fields by ', '
// that support it, and dropping duplicates for other fields.

var common = require('../common');
var assert = require('assert');
var http = require('http');

var srv = http.createServer(function(req, res) {
  assert.equal(req.headers.accept, 'abc, def, ghijklmnopqrst');
  assert.equal(req.headers.host, 'foo');
  assert.equal(req.headers['x-foo'], 'bingo');
  assert.equal(req.headers['x-bar'], 'banjo, bango');

  res.writeHead(200, {'Content-Type' : 'text/plain'});
  res.end('EOF');

  srv.close();
});

srv.listen(common.PORT, function() {
  http.get({
    host: 'localhost',
    port: common.PORT,
    path: '/',
    headers: [
      ['accept', 'abc'],
      ['accept', 'def'],
      ['Accept', 'ghijklmnopqrst'],
      ['host', 'foo'],
      ['Host', 'bar'],
      ['hOst', 'baz'],
      ['x-foo', 'bingo'],
      ['x-bar', 'banjo'],
      ['x-bar', 'bango']
    ]
  });
});