Virtual host splitting for Koa.js v2.

Install

$ npm install --save @someimportantcompany/koa-vhost

Usage

const Koa = require('koa');
const vhost = require('@someimportantcompany/koa-vhost');

const app = new Koa();

app.use(vhost('s1.example.com', ctx => {
  ctx.status = 200;
  ctx.body = 'server s1';
}));

app.use(vhost(/(s2|s3).example.com/, ctx => {
  ctx.status = 200;
  ctx.body = 'server s2 or s3';
}));

app.use(vhost([ 's4.example.com', 's5.example.com' ], ctx => {
  ctx.status = 200;
  ctx.body = 'server s4 or s5';
}));

app.use(vhost('t2.example.com', ctx => {
  ctx.status = 200;
  ctx.body = 'server t2';
}));

app.use(ctx => {
  ctx.status = 200;
  ctx.body = 'generic server';
});

app.listen(3000);

Then, assuming httpie:

$ http --print=HhBb http://localhost:54321
GET / HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate
Connection: keep-alive
Host: localhost:54321
User-Agent: HTTPie/1.0.3


HTTP/1.1 200 OK
Connection: keep-alive
Content-Length: 14
Content-Type: text/plain; charset=utf-8
Date: Sat, 03 Apr 2021 12:47:33 GMT
Keep-Alive: timeout=5

generic server

$ http --print=HhBb http://localhost:54321 Host:s1.example.com
GET / HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate
Connection: keep-alive
Host: s1.example.com
User-Agent: HTTPie/1.0.3

HTTP/1.1 200 OK
Connection: keep-alive
Content-Length: 9
Content-Type: text/plain; charset=utf-8
Date: Sat, 03 Apr 2021 12:48:43 GMT
Keep-Alive: timeout=5

server s1

$ http --print=HhBb http://localhost:54321 Host:s2.example.com
GET / HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate
Connection: keep-alive
Host: s1.example.com
User-Agent: HTTPie/1.0.3

HTTP/1.1 200 OK
Connection: keep-alive
Content-Length: 9
Content-Type: text/plain; charset=utf-8
Date: Sat, 03 Apr 2021 12:48:43 GMT
Keep-Alive: timeout=5

server s2 or s3

API

vhost(hosts, middleware)

Option	Description
hosts	Either a Function, Array, RegExp or String of the hosts to match.
middleware	Middleware Function to execute if the hostname matches.

Notes

• Any questions or suggestions please open an issue.