Deno port of proxy-addr library.
import { serve } from 'https://deno.land/std@0.88.0/http/server.ts'
import { proxyaddr } from 'https://deno.land/x/proxy_addr/mod.ts'
const s = await serve({ port: 3000 })
for await (const req of s) console.log(proxyaddr(s))
