express-openid-connect: Authorization code flow results in "connect ECONNREFUSED 127.0.0.1:443"

Description

Hello, I am currently in the process of testing the upgrade path to 2.0.0 of this library using Auth0 as my oauth provider. After logging in to Auth0, the callback endpoint fails with the following error: BadRequestError: connect ECONNREFUSED 127.0.0.1:443 at /Users/hsostock/code/connect-web/node_modules/express-openid-connect/middleware/auth.js:105:31 at processTicksAndRejections (internal/process/task_queues.js:97:5)

Note: After doing some debugging, it appears that this is the result of an internal call to https://{auth0-domain}/.well-known/oauth-authorization-server returning a 404 Not Found error (which, for some reason, is surfaced as the above connection refused error).

Reproduction

I am using the following configuration in my express app:

const app = express();
app.use(oidc.auth({
  secret: "secret value",
  routes: {
    login: '/auth/login',
    logout: '/auth/logout',
    postLogoutRedirect: '/',
    callback: '/auth/callback',
  },
  session: {
    rolling: false,
    absoluteDuration: 60, // 60 seconds
  },
  authRequired: true,
  auth0Logout: true,
  clientID: "secret value",
  clientSecret: "secret value",
  baseURL: config.webUrl,
  issuerBaseURL: config.auth.issuerBaseURL,

  authorizationParams: {
    scope: 'openid profile email offline_access',
    response_type: 'code',
  },
}));

And occurs consistently (as mentioned) when validating the authorization code returned from Auth0.

Environment

• Version of this library used: 2.0.0
• Version of the platform or framework used, if applicable: Express 4.17.1
• Other relevant versions (language, server software, OS, browser): Node.js 12.13.1 / Typescript / Chrome