clj-http 介绍
clj-http 是一个新的 Clojure HTTP
客户端开发包，主要特点是设计简单、可靠、可扩展和可测试。
示例代码：
(require '[clj-http.client :as client])
(client/get "http://rest-test.heroku.com/")
=> {:status 200
:headers {"date" "Sun, 01 Aug 2010 07:03:49 GMT"
"cache-control" "private, max-age=0, must-revalidate"
"content-type" "text/html; charset=utf-8"
...}
:body "GET http://rest-test.heroku.com/"}