test/parallel/test-http-write-callbacks.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');

let serverEndCb = false;
let serverIncoming = '';
const serverIncomingExpect = 'bazquuxblerg';

let clientEndCb = false;
let clientIncoming = '';
const clientIncomingExpect = 'asdffoobar';

process.on('exit', () => {
  assert(serverEndCb);
  assert.strictEqual(serverIncoming, serverIncomingExpect);
  assert(clientEndCb);
  assert.strictEqual(clientIncoming, clientIncomingExpect);
  console.log('ok');
});

// Verify that we get a callback when we do res.write(..., cb)
const server = http.createServer((req, res) => {
  res.statusCode = 400;
  res.end('Bad Request.\nMust send Expect:100-continue\n');
});

server.on('checkContinue', common.mustCall((req, res) => {
  server.close();
  assert.strictEqual(req.method, 'PUT');
  res.writeContinue(() => {
    // Continue has been written
    req.on('end', () => {
      res.write('asdf', common.mustSucceed(() => {
        res.write('foo', 'ascii', common.mustSucceed(() => {
          res.end(Buffer.from('bar'), 'buffer', common.mustSucceed(() => {
            serverEndCb = true;
          }));
        }));
      }));
    });
  });

  req.setEncoding('ascii');
  req.on('data', (c) => {
    serverIncoming += c;
  });
}));

server.listen(0, common.mustCall(function() {
  const req = http.request({
    port: this.address().port,
    method: 'PUT',
    headers: { 'expect': '100-continue' }
  });
  req.on('continue', () => {
    // ok, good to go.
    req.write('YmF6', 'base64', common.mustSucceed(() => {
      req.write(Buffer.from('quux'), common.mustSucceed(() => {
        req.end('626c657267', 'hex', common.mustSucceed(() => {
          clientEndCb = true;
        }));
      }));
    }));
  });
  req.on('response', common.mustCall((res) => {
    // This should not come until after the end is flushed out
    assert(clientEndCb);
    res.setEncoding('ascii');
    res.on('data', (c) => {
      clientIncoming += c;
    });
  }));
}));