Created
January 20, 2023 02:30
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Read streaming response with fetch
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| const http = require('http') | |
| const express = require('express') | |
| const app = express() | |
| app.get('/', (req, res) => { | |
| res.setHeader('Content-Type', 'text/html') | |
| res.setHeader('Transfer-Encoding', 'chunked'); | |
| res.send(`<html><body><h1>Hello World</h1> | |
| <ul id="list"></ul> | |
| <script> | |
| fetch('/stream').then(res => { | |
| const reader = res.body.getReader() | |
| const decoder = new TextDecoder('utf-8') | |
| reader.read().then(function processResult(result) { | |
| if (result.done) return | |
| const chunk = decoder.decode(result.value) | |
| const li = document.createElement('li') | |
| li.textContent = chunk | |
| document.getElementById('list').appendChild(li) | |
| return reader.read().then(processResult) | |
| }) | |
| }) | |
| </script> | |
| </body></html>`) | |
| }) | |
| app.get('/stream', (req, res) => { | |
| res.setHeader('Content-Type', 'text/plain') | |
| res.setHeader('Transfer-Encoding', 'chunked'); | |
| res.write('Hello') | |
| streamResponse(res, 0) | |
| }) | |
| const streamResponse = (res, num) => { | |
| if (num > 10) { | |
| console.log('end') | |
| res.end() | |
| return | |
| } | |
| res.write(`Hi! part ${num}`) | |
| setTimeout(() => streamResponse(res, num + 1), 1000) | |
| } | |
| http.createServer(app).listen(3000) |
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