Node.js http.server.listen() Method
Last Updated :
06 Apr, 2023
The http.server.listen() is an inbuilt application programming interface of the class Server within the HTTP module which is used to start the server by accepting new connections.
Syntax:
const server.listen(options[, callback])
Parameters: This method accepts the following two parameters:
- option: It can be the port, host, path, backlog, exclusive, readableAll, writableAll, ipv6Only, etc depending upon user need.
- callback: It is an optional parameter, it is the callback function that is passed as a parameter.
Return Value: This method returns nothing but a callback function.
Example 1: Filename-index.js
Javascript
var http = require('http');
const PORT = process.env.PORT || 3000;
const httpServer = http.createServer(
function (request, response) {
const value = response.socket;
response.end("socket buffersize : "
+ value.bufferSize, 'utf8', () => {
console.log("displaying the result...");
httpServer.close(() => {
console.log("server is closed")
})
});
});
httpServer.listen(PORT, () => {
console.log("Server is running at port 3000...");
});
|
Run the index.js file using the following command:
node index.js
Output:
Server is running at port 3000...
displaying the result...
server is closed
Now run http://localhost:3000/ in the browser and you will see the following output on screen:
socket buffersize : 0
Example 2: Filename-index.js
Javascript
const http = require('http');
const httpHandlers = (request, response) => {
const value = response.socket;
response.end("socket local address : "
+ value.localAddress, 'utf8', () => {
console.log("displaying the result...");
httpServer.close(() => {
console.log("server is closed")
})
});
};
const httpServer = http.createServer(
httpHandlers).listen(3000, () => {
console.log("Server is running at port 3000...");
});
|
Run the index.js file using the following command:
node index.js
Output:
Server is running at port 3000...
displaying the result...
server is closed
Now run http://localhost:3000/ in the browser and you will see the following output on the screen:
socket local address : ::1
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http.html#http_server_listen
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