Node.js response.writeContinue() Method
Last Updated :
23 Sep, 2020
The response.writeContinue() (Added in v0.3.0) method is an inbuilt Application Programming Interface of the ‘http’ module which sends an HTTP/1.1 100 Continue message to the client, indicating that the request body should be sent. See the 'checkContinue' event on Server. The response.writeContinue() is called internally even when no listener is attached.
In order to get a response and a proper result, we need to import ‘http’ module.
Import:
const http = require('http');
Syntax:
response.writeContinue();
Parameters: This method does not accept any parameter.
Return Value: It does not return any value, instead sends an HTTP/1.1 100 Continue message to the client, indicating that the request body should be sent.
The below example illustrates the use of the response.writeContinue() method in Node.js.
Example 1: Program without response.writeContinue() method.
Filename: index.js
javascript
// Node.js program to demonstrate the
// response.writeContinue() Method
// Importing http module
var http = require('http');
// Setting up PORT
const PORT = process.env.PORT || 3000;
// Creating http Server
var httpServer = http.createServer(function(request, response){
// Writing string data
response.write("Heyy geeksforgeeks ", 'utf8', () => {
console.log("Writing Data...");
});
// Defining Buffer 'Hello world'
const buf = Buffer.alloc(11, 'aGVsbG8gd29ybGQ=', 'base64');
// Writing the buffer data.
response.write(buf, 'utf8', () => {
console.log("Writing Buffer Data...");
});
// Prints Output on the browser in response
response.end(' ok');
});
// Listening to http Server
httpServer.listen(PORT, () => {
console.log("Server is running at port 3000...");
});
Output:
Output: In-Console
Server is running at port 3000...
Writing Data...
Writing Buffer Data...
Now run http://localhost:3000/ in the browser.
Output: In-Browser
Heyy geeksforgeeks hello world ok
Example 2: Using response.writeContinue() method.
Filename: index.js
javascript
// Node.js program to demonstrate the
// response.writeContinue() Method
// Importing http module
var http = require('http');
// Setting up PORT
const PORT = process.env.PORT || 3000;
// Creating http Server
var httpServer = http.createServer(function(request, response){
// Writing string data
response.write("Heyy geeksforgeeks ", 'utf8', () => {
console.log("Writing Data...");
});
// Using response.writeContinue() method
response.writeContinue();
// Defining Buffer 'Hello world'
const buf = Buffer.alloc(11, 'aGVsbG8gd29ybGQ=', 'base64');
// Writing the buffer data.
response.write(buf, 'utf8', () => {
console.log("Writing Buffer Data...");
});
// Prints Output on the browser in response
response.end(' ok');
});
// Listening to http Server
httpServer.listen(PORT, () => {
console.log("Server is running at port 3000...");
});
Run index.js file using the following command:
node index.js
Output:
Output: In-Console
Server is running at port 3000...
Writing Data...
Writing Buffer Data...
Reference: https://nodejs.org/api/http.html#http_response_writecontinue
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