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domain	koajs.com
summary	This text describes a Koa application setup in Node.js, a popular server-side JavaScript runtime. The code begins with a simple Koa application bound to port 3000: ```javascript const Koa = require('koa'); const app = new Koa(); app.listen(3000); ``` The `app.listen()` method is explained as a convenience for creating both HTTP and HTTPS servers or multiple address bindings. The code then demonstrates how to create separate servers for HTTP (port 3000) and HTTPS (port 3001): ```javascript const http = require('http'); const https = require('https'); const Koa = require('koa'); const app = new Koa(); http.createServer(app.callback).listen(3000); https.createServer(app.callback).listen(3001); ``` The `app.callback` function is a callback that handles incoming requests, which returns a context (`ctx`) per request. This context is referenced in middleware as the receiver or `ctx` identifier: ```javascript app.use(async (ctx) => { // Handle request logic here }); ``` The `ctx` object contains two main accessors: `ctx.request`, which represents the incoming request, and `ctx.response`, which is a Koa Response object used to send responses. Many context accessors and methods in Koa delegate to their `ctx.request` or `ctx.response` equivalents for convenience.
title	Koa - next generation web framework for node.js
description	Koa - next generation web framework for node.js
keywords	request, response, header, true, object, content, error, default, type, cookie, status, http, string, more, value, proxy, example
upstreams
downstreams
nslookup	A 185.199.111.153, A 185.199.109.153, A 185.199.108.153, A 185.199.110.153
created	2025-11-10
updated	2025-11-10
summarized	2025-11-14

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