Amazon Product Advertising APIを使ってISBNコードで書籍を検索する
$ go run src/goamzn-isbn/main.go
$ curl -i http://localhost:8080/search/isbn 391ms 水 12/13 02:54:01 2017
HTTP/1.1 200 OK
Date: Tue, 12 Dec 2017 17:54:43 GMT
Content-Length: 0
Content-Type: text/plain; charset=utf-8