Golang evio

package main

import (
    "bytes"
    "strings"
    "github.com/tidwall/evio"
)

func main() {
    const content = "HTTP/1.1 200 Ok\r\nContent-Length: 11\r\n\r\nHello World"
    var builder strings.Builder
    for i := 0; i < 512; i++ { builder.WriteString(content) }
    response := []byte(builder.String())

    var events evio.Events
    events.NumLoops = -1
    events.Data = func(c evio.Conn, in []byte) (out []byte, action evio.Action) {
        if in == nil { return }
        requests := 0
        for {
            offset := bytes.Index(in, []byte("\r\n\r\n"))
            if offset == -1 { break }
            in = in[(offset + 4):]
            requests++
        }
        out = response[:(len(content) * requests)]
        return
    }
    if err := evio.Serve(events, "tcp://localhost:12345"); err != nil {
        panic(err.Error())
    }
}