filter

type Chain struct {
	Filters  []Filter
	Index    int
	Exchange *Exchange
	Route    config.Route
}

type Exchange struct {
	Resp      http.ResponseWriter
	Req       *http.Request
	Ctx       context.Context
	Attr      map[string]interface{}
	Err       error
	Completed bool
	Written   sync.Once
}

type Filter interface {
	Init()
	Name() string
	Filter(exchange *Exchange, c interface{}) error
}

type ProxyConfig struct {
	URI string `asn1:"url"`
}

type ResourceConfig struct {
	Root string
}

type RewriteConfig struct {
	Regex       string
	Replacement string
}