test/parallel/test-http-write-head.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
const common = require('../common');
const assert = require('assert');
const http = require('http');

// Verify that ServerResponse.writeHead() works as setHeader.
// Issue 5036 on github.

const s = http.createServer(common.mustCall((req, res) => {
  res.setHeader('test', '1');

  // toLowerCase() is used on the name argument, so it must be a string.
  // Non-String header names should throw
  common.expectsError(
    () => res.setHeader(0xf00, 'bar'),
    {
      code: 'ERR_INVALID_HTTP_TOKEN',
      type: TypeError,
      message: 'Header name must be a valid HTTP token ["3840"]'
    }
  );

  // Undefined value should throw, via 979d0ca8
  common.expectsError(
    () => res.setHeader('foo', undefined),
    {
      code: 'ERR_HTTP_INVALID_HEADER_VALUE',
      type: TypeError,
      message: 'Invalid value "undefined" for header "foo"'
    }
  );

  res.writeHead(200, { Test: '2' });

  common.expectsError(() => {
    res.writeHead(100, {});
  }, {
    code: 'ERR_HTTP_HEADERS_SENT',
    type: Error,
    message: 'Cannot render headers after they are sent to the client'
  });

  res.end();
}));

s.listen(0, common.mustCall(runTest));

function runTest() {
  http.get({ port: this.address().port }, common.mustCall((response) => {
    response.on('end', common.mustCall(() => {
      assert.strictEqual(response.headers.test, '2');
      assert(response.rawHeaders.includes('Test'));
      s.close();
    }));
    response.resume();
  }));
}