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Express.js req.range() Function
  • Last Updated : 09 Jul, 2020

The req.range() function is basically a Range header parser where the Accept-Ranges response-header field allows the server to indicate its acceptance of range requests for a resource.

Syntax:

req.range(size[, options])

Parameter:

  1. size: It is the maximum size of the resource.
  2. options: It is an object which can have combine property.

Return Value: It returns an array of ranges.

Installation of express module:



  1. You can visit the link to Install express module. You can install this package by using this command.
    npm install express
  2. After installing the express module, you can check your express version in command prompt using the command.
    npm version express
  3. 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.get('Range'));    
    console.log(req.range());
    res.end();
});
  
app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Steps to run the program:

  1. The project structure will look like this:
  2. Make sure you have installed express module using the following command:
    npm install express
  3. Run index.js file using below command:
    node index.js

    Output:

    Server listening on PORT 3000
    
  4. Now make a GET request to http://localhost:3000/ with header set to ‘ Range: bytes=200-1000’, then you will see the following output on your console:
    Server listening on PORT 3000
    bytes=200-1000
    [ { start: 200, end: 1000 }, type: 'bytes' ]
    

Example 2: Filename: index.js




var express = require('express');
var app = express();
var PORT = 3000;
   
app.get('/', function (req, res) {
  
    // Without range header set
    console.log(req.range());
    res.end();
});
   
app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Run index.js file using below command:

node index.js

Now make a GET request to http://localhost:3000/ without setting any header, then you will see the following output on your console:

Server listening on PORT 3000
undefined

Reference: https://expressjs.com/en/5x/api.html#req.range

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