Express.js req.fresh Property
The req.fresh property returns true if the response is still ‘fresh’ in the client’s cache else it will return false.
Syntax:
req.fresh
Parameter: No parameter
Return Value: True or False
Installation of express module:
- You can visit the link to Install express module. You can install this package by using this command.
npm install express
- After installing the express module, you can check your express version in command prompt using the command.
npm version express
- After that, you can just create a folder and add a file for example, index.js. To run this file you need to run the following command.
node index.js
Example 1: Filename: index.js
var express = require( 'express' ); var app = express(); var PORT = 3000; app.get( '/' , function (req, res) { console.log(req.fresh); res.send(); }); app.listen(PORT, function (err){ if (err) console.log(err); console.log( "Server listening on PORT" , PORT); }); |
Steps to run the program:
- The project structure will look like this:
- Make sure you have installed express module using the following command:
npm install express
- Run index.js file using below command:
node index.js
Output:
Server listening on PORT 3000
- Now open your browser and go to http://localhost:3000/, now you can see the following output on your console:
Server listening on PORT 3000 false
Example 2: Consider the above code but this time, make a GET request to http://localhost:3000/ with Header set to Cache-Control: no-cache, now you can see the following output on your console:
Server listening on PORT 3000 false