# Passport.js Node Interface Requirements (High-Level)

- **Middleware pipeline**
  - Supports `req`, `res`, and `next()` chaining (Express/Connect interface).

- **HTTP request/response objects**
  - `req` and `res` implement Node’s `IncomingMessage` / `ServerResponse` APIs.
  - Expose: `headers`, `method`, `url`, `statusCode`, etc.
  - Both behave as **EventEmitters**.

- **Request parsing**
  - Access to `req.body`, `req.query`, and `req.params`.

- **Cookies**
  - Ability to read and set cookies (`req.cookies`, `res.cookie()`).

- **Sessions**
  - Session mechanism (`req.session`) or equivalent for authentication persistence.

- **Redirects**
  - Response redirection (`res.redirect()` or manual 302 responses).

- **Header manipulation**
  - Support for `req.headers`, `res.setHeader()`, and `res.getHeader()`.

- **Crypto utilities**
  - Access to hashing, signing, and verification (Node’s `crypto` module).

- **URL and body parsing**
  - `url`, `querystring`, and `body-parser` middleware compatibility.