doc: add missing zstd to mjs example of zlib

[deokjinkim]

For reference, cjs example already has zstd as compression encoding.

1. Client request example

(1) mjs

node/doc/api/zlib.md

Lines 237 to 273 in 6f7f51b

	// Client request example
	import fs from 'node:fs';
	import zlib from 'node:zlib';
	import http from 'node:http';
	import process from 'node:process';
	import { pipeline } from 'node:stream';
	const request = http.get({ host: 'example.com',
	path: '/',
	port: 80,
	headers: { 'Accept-Encoding': 'br,gzip,deflate' } });
	request.on('response', (response) => {
	const output = fs.createWriteStream('example.com_index.html');
	const onError = (err) => {
	if (err) {
	console.error('An error occurred:', err);
	process.exitCode = 1;
	}
	};
	switch (response.headers['content-encoding']) {
	case 'br':
	pipeline(response, zlib.createBrotliDecompress(), output, onError);
	break;
	// Or, just use zlib.createUnzip() to handle both of the following cases:
	case 'gzip':
	pipeline(response, zlib.createGunzip(), output, onError);
	break;
	case 'deflate':
	pipeline(response, zlib.createInflate(), output, onError);
	break;
	default:
	pipeline(response, output, onError);
	break;
	}
	});

(2) cjs

node/doc/api/zlib.md

Lines 277 to 314 in 6f7f51b

	// Client request example
	const zlib = require('node:zlib');
	const http = require('node:http');
	const fs = require('node:fs');
	const { pipeline } = require('node:stream');
	const request = http.get({ host: 'example.com',
	path: '/',
	port: 80,
	headers: { 'Accept-Encoding': 'br,gzip,deflate,zstd' } });
	request.on('response', (response) => {
	const output = fs.createWriteStream('example.com_index.html');
	const onError = (err) => {
	if (err) {
	console.error('An error occurred:', err);
	process.exitCode = 1;
	}
	};
	switch (response.headers['content-encoding']) {
	case 'br':
	pipeline(response, zlib.createBrotliDecompress(), output, onError);
	break;
	// Or, just use zlib.createUnzip() to handle both of the following cases:
	case 'gzip':
	pipeline(response, zlib.createGunzip(), output, onError);
	break;
	case 'deflate':
	pipeline(response, zlib.createInflate(), output, onError);
	break;
	case 'zstd':
	pipeline(response, zlib.createZstdDecompress(), output, onError);
	break;
	default:
	pipeline(response, output, onError);
	break;
	}

2. Server example

(1) mjs

node/doc/api/zlib.md

Lines 319 to 360 in 6f7f51b

	// server example
	// Running a gzip operation on every request is quite expensive.
	// It would be much more efficient to cache the compressed buffer.
	import zlib from 'node:zlib';
	import http from 'node:http';
	import fs from 'node:fs';
	import { pipeline } from 'node:stream';
	http.createServer((request, response) => {
	const raw = fs.createReadStream('index.html');
	// Store both a compressed and an uncompressed version of the resource.
	response.setHeader('Vary', 'Accept-Encoding');
	const acceptEncoding = request.headers['accept-encoding'] || '';
	const onError = (err) => {
	if (err) {
	// If an error occurs, there's not much we can do because
	// the server has already sent the 200 response code and
	// some amount of data has already been sent to the client.
	// The best we can do is terminate the response immediately
	// and log the error.
	response.end();
	console.error('An error occurred:', err);
	}
	};
	// Note: This is not a conformant accept-encoding parser.
	// See https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.3
	if (/\bdeflate\b/.test(acceptEncoding)) {
	response.writeHead(200, { 'Content-Encoding': 'deflate' });
	pipeline(raw, zlib.createDeflate(), response, onError);
	} else if (/\bgzip\b/.test(acceptEncoding)) {
	response.writeHead(200, { 'Content-Encoding': 'gzip' });
	pipeline(raw, zlib.createGzip(), response, onError);
	} else if (/\bbr\b/.test(acceptEncoding)) {
	response.writeHead(200, { 'Content-Encoding': 'br' });
	pipeline(raw, zlib.createBrotliCompress(), response, onError);
	} else {
	response.writeHead(200, {});
	pipeline(raw, response, onError);
	}
	}).listen(1337);

(2) cjs

node/doc/api/zlib.md

Lines 364 to 408 in 6f7f51b

	// server example
	// Running a gzip operation on every request is quite expensive.
	// It would be much more efficient to cache the compressed buffer.
	const zlib = require('node:zlib');
	const http = require('node:http');
	const fs = require('node:fs');
	const { pipeline } = require('node:stream');
	http.createServer((request, response) => {
	const raw = fs.createReadStream('index.html');
	// Store both a compressed and an uncompressed version of the resource.
	response.setHeader('Vary', 'Accept-Encoding');
	const acceptEncoding = request.headers['accept-encoding'] || '';
	const onError = (err) => {
	if (err) {
	// If an error occurs, there's not much we can do because
	// the server has already sent the 200 response code and
	// some amount of data has already been sent to the client.
	// The best we can do is terminate the response immediately
	// and log the error.
	response.end();
	console.error('An error occurred:', err);
	}
	};
	// Note: This is not a conformant accept-encoding parser.
	// See https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.3
	if (/\bdeflate\b/.test(acceptEncoding)) {
	response.writeHead(200, { 'Content-Encoding': 'deflate' });
	pipeline(raw, zlib.createDeflate(), response, onError);
	} else if (/\bgzip\b/.test(acceptEncoding)) {
	response.writeHead(200, { 'Content-Encoding': 'gzip' });
	pipeline(raw, zlib.createGzip(), response, onError);
	} else if (/\bbr\b/.test(acceptEncoding)) {
	response.writeHead(200, { 'Content-Encoding': 'br' });
	pipeline(raw, zlib.createBrotliCompress(), response, onError);
	} else if (/\bzstd\b/.test(acceptEncoding)) {
	response.writeHead(200, { 'Content-Encoding': 'zstd' });
	pipeline(raw, zlib.createZstdCompress(), response, onError);
	} else {
	response.writeHead(200, {});
	pipeline(raw, response, onError);
	}
	}).listen(1337);

Refs: #52100

[nodejs-github-bot]

Landed in 80e0779