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gzip のやり方

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普通に文字列 (string) から gzip を生成するやり方
エラーハンドリングは省略

import (
  "bytes"
  "compress/gzip"
)

func makeGzip(body string) []byte {
  var b bytes.Buffer
  gw := gzip.NewWriter(&b)
  _, err := gw.Write([]byte(body)); if err != nil {
    ...
  }
  gw.Flush()
  gw.Close()
  return b.Bytes()
}

gw.Close() はファイルストリームのクローズみたいな挙動ではなく,
gzip のフッターデータ書き込みなので defer 等で最後に回そうとすると
不正なデータになってしまうので注意. (とりあえず解凍はできない)
Close() は Flush() の処理を含んでいるかもしれませんが自信がないです.

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