expressjsHow do I use Express.js to make an options request?

An options request is a type of HTTP request used to determine the capabilities of a server. Express.js can be used to make such a request.

Below is an example of an options request using Express.js:

const express = require('express');
const app = express();

app.options('/', (req, res) => {
  res.status(200).send('OK');
});

app.listen(3000);

This code will create a server listening on port 3000, and will respond to an options request on the root path with an HTTP status code of 200 and a message of 'OK'.

The code consists of the following parts:

1. const express = require('express'); - This line imports the Express.js module and saves it as a constant.
2. const app = express(); - This line creates an Express.js application and saves it as a constant.
3. app.options('/', (req, res) => { - This line defines a route for an options request on the root path.
4. res.status(200).send('OK'); - This line sets the response status code to 200 and sends a message of 'OK'.
5. app.listen(3000); - This line starts the server listening on port 3000.

For more information on options requests and Express.js, see the following links:

• Express.js Documentation
• MDN Web Docs - HTTP Options Request

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