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Express.js – req.range() Method
req.range() is basically a range header parser. The accept-ranges and the response-header fields allow the server to indicate the acceptance of the range requests from a resource.
Syntax
req.range( size, [options])
Parameters
The above parameters are defined as follows −
size – The size parameter defines the maximum size of the resource.
options – The options parameter can have the following properties −
combine – It is a Boolean type variable. This parameter specifies if overlapping and whether the adjacent ranges should be combined or not. Default: False
Example 1
Create a file with the name "reqRange.js" and copy the following code snippet. After creating the file, use the command "node reqRange.js" to run this code as shown in the example below −
// Specifying status code Demo Example
// Importing the express module
var express = require('express');
// Initializing the express and port number
var app = express();
var PORT = 3000;
// Creating an endpoint
app.get("/api", (req, res) => {
res.status(400);
res.send("Bad Request Received")
})
app.listen(PORT, function(err){
if (err) console.log(err);
console.log("Server listening on PORT", PORT);
});Hit the following URL endpoint for a GET request −
http://localhost:3000/
and set the following property in header −
--> Range(Key) -> bytes=500-1000
Output
C:\home
ode>> node reqRange.js Server listening on PORT 3000 bytes=500-1000 [ { start: 500, end: 1000 }, type: 'bytes' ]
Example 2 Without Range header set
Let's take a look at one more example.
// req.range() code Demo Example
// Importing the express module
var express = require('express');
// Initializing the express and port number
var app = express();
var PORT = 3000;
// Creating an endpoint
app.get('/', function (req, res) {
console.log(req.range());
res.end();
});
app.listen(PORT, function(err){
if (err) console.log(err);
console.log("Server listening on PORT", PORT);
});Hit the following URL endpoint for a GET request − http://localhost:3000/
Output
C:\home
ode>> node reqRange.js Server listening on PORT 3000 undefined
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