old_contents: import compression from 'compression';
  import Express from 'express';
  import path from 'path';
  import fs from 'fs';
  import Raven from 'raven';
  import bodyParser from 'body-parser';
  
  import loadDotEnv from './config/env';
  
  process.env.NODE_ENV = process.env.NODE_ENV || 'development';
  const appDirectory = fs.realpathSync(process.cwd());
  
  loadDotEnv(appDirectory);
  
  if (process.env.RAVEN_DSN) {
    Raven.config(process.env.RAVEN_DSN, {
      captureUnhandledRejections: true,
    }).install();
  }
  // Any files that exist can be accessed directly.
  // If the server has been compiled, the path will be different.
  const buildFolder = path.basename(appDirectory) === 'build' ? path.join(appDirectory, '..', '..', 'build') : path.join(appDirectory, '..', 'build');
  
  const app = Express();
  
  if (Raven.installed) {
    // The Raven request handler must be the first middleware on the app
    app.use(Raven.requestHandler());
    // The error handler must be before any other error middleware
    app.use(Raven.errorHandler());
  }
  app.use(compression());
  app.use(Express.static(buildFolder));
  app.use(bodyParser.urlencoded({ extended: false }));
  
  app.use(require('./controllers').default);
  
  app.listen(process.env.PORT, () => {
    console.log(`Listening to port ${process.env.PORT}`);
  });
  
new_contents: import compression from 'compression';
  import Express from 'express';
  import path from 'path';
  import fs from 'fs';
  import Raven from 'raven';
  import session from 'express-session';
  import bodyParser from 'body-parser';
  import Passport from 'passport';
  
  import loadDotEnv from './config/env';
  
  process.env.NODE_ENV = process.env.NODE_ENV || 'development';
  const appDirectory = fs.realpathSync(process.cwd());
  
  loadDotEnv(appDirectory);
  
  if (process.env.RAVEN_DSN) {
    Raven.config(process.env.RAVEN_DSN, {
      captureUnhandledRejections: true,
    }).install();
  }
  // Any files that exist can be accessed directly.
  // If the server has been compiled, the path will be different.
  const buildFolder = path.basename(appDirectory) === 'build' ? path.join(appDirectory, '..', '..', 'build') : path.join(appDirectory, '..', 'build');
  
  const app = Express();
  
  if (Raven.installed) {
    // The Raven request handler must be the first middleware on the app
    app.use(Raven.requestHandler());
    // The error handler must be before any other error middleware
    app.use(Raven.errorHandler());
  }
  app.use(compression());
  app.use(Express.static(buildFolder));
  let sessionSecret = process.env.SESSION_SECRET;
  if (!sessionSecret) {
    if (process.env.NODE_ENV === 'production') {
      throw new Error('Missing environment variable: SESSION_SECRET. You should set this in the `.env.production.local` file.');
    } else {
      sessionSecret = 'somesecrettoken';
    }
  }
  app.use(session({
    secret: sessionSecret,
    resave: false,
    saveUninitialized: false,
  }));
  app.use(bodyParser.urlencoded({ extended: false }));
  
  // region Authentication
  app.use(Passport.initialize());
  app.use(Passport.session());
  Passport.serializeUser(function(user, done) {
    done(null, user);
  });
  Passport.deserializeUser(function(user, done) {
    done(null, user);
  });
  // endregion
  
  app.use(require('./controllers').default);
  
  app.listen(process.env.PORT, () => {
    console.log(`Listening to port ${process.env.PORT}`);
  });
  
subject: Revert "Disable session and Passport usage"