A proxy would work for this. Assuming @koa/router or something simliar and the http-proxy module (there are also wrapper modules for Koa that may work:
const proxy = httpProxy.createProxyServer({
target: 'https://some-other-server.com',
// other options, see https://www.npmjs.com/package/http-proxy
})
proxy.on('proxyReq', (proxyReq, req, res, options) => {
proxyReq.setHeader('x-foo', 'bar')
})
proxy.on('proxyRes', (proxyRes, req, res) => {
proxyRes.removeHeader('x-foo')
})
router.get('/foo', async (ctx) => {
// ctx.req and ctx.res are the Node req and res, not Koa objects
proxy.web(ctx.req, ctx.res, {
// other options, see docs
})
})
You could also lift the proxy out of a route if you happen to be starting your Koa server with http.createServer
rather than app.listen
:
// where app = new Koa()
const handler = app.callback()
http.createServer((req, res) => {
if (req.url === '/foo') {
return proxy.web(req, res, options)
}
return handler(req, res)
})
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