package mux

import (
	"io"
	"net/http"
)

type optionsHandler struct{}

func (optionsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Length", "0")
	if r.ContentLength != 0 {
		// Read up to 4KB of OPTIONS body (as mentioned in the
		// spec as being reserved for future use), but anything
		// over that is considered a waste of server resources
		// (or an attack) and we abort and close the connection,
		// courtesy of MaxBytesReader's EOF behavior.
		mb := http.MaxBytesReader(w, r.Body, 4<<10)
		io.Copy(io.Discard, mb)
	}
}