HttpAsyncClient 是一个异步的 HTTP 客户端开发包，基于 HttpCore NIO 和 HttpClient 组件。

HttpAsyncClient 的出现并不是为了替换 HttpClient，而是作为一个补充用于需要大量并发连接，对性能要求非常高的基于HTTP的原生数据通信，而且提供了事件驱动的 API。

HttpComponents HttpAsyncClient 4.1-beta1 发布，此版本现已提供下载，值得关注的更新内容如下：

* Support for pipelined request execution * Enhanced redesigned and rewritten default SSL hostname verifier withimproved RFC 2818 compliance* Default SSL hostname verifier and default cookie policy now validatecertificate identity and cookie domain of origin against the publicsuffix list maintained by Mozilla.org 
    
     * Authentication cache thread-safety: authentication caches used byHttpAsyncClient is now thread-safe and can be shared by multiplecontexts in order to re-use authentication state for subsequent requests
    

文章转载自 开源中国社区 [