remove unused Header impl of hono middleware support

exp/hono/header.go

@@ -1,63 +0,0 @@
-package hono
-
-import (
-	"strings"
-	"syscall/js"
-)
-
-type Header interface {
-	Add(key, value string)
-	Set(key, value string)
-	Get(key string) string
-	Values(key string) []string
-	Entries() []HeaderEntry
-	// Write(w io.Writer) // TODO: implement
-	// Clone() httpHeader // Not planned to be implemented
-}
-
-type HeaderEntry struct {
-	Key    string
-	Values []string
-}
-
-type header struct {
-	headerObj js.Value
-}
-
-var _ Header = (*header)(nil)
-
-func (h *header) Add(key, value string) {
-	h.headerObj.Call("append", key, value)
-}
-
-func (h *header) Set(key, value string) {
-	h.headerObj.Call("set", key, value)
-}
-
-func (h *header) Get(key string) string {
-	vs := h.Values(key)
-	if len(vs) == 0 {
-		return ""
-	}
-	return vs[0]
-}
-
-func (h *header) Values(key string) []string {
-	values := h.headerObj.Call("get", key).String()
-	return strings.Split(values, ",")
-}
-
-func (h *header) Entries() []HeaderEntry {
-	var entries []HeaderEntry
-	entriesObj := js.Global().Get("Object").Call("entries", h.headerObj)
-	for i := 0; i < entriesObj.Length(); i++ {
-		entryObj := entriesObj.Index(i)
-		key := entryObj.Index(0).String()
-		values := entryObj.Index(1).String()
-		entries[i] = HeaderEntry{
-			Key:    key,
-			Values: strings.Split(values, ","),
-		}
-	}
-	return entries
-}