asio示例：
Unicomm is a multiplatform C++ framework that allows to create custom network protocols over TCP transport. Unicomm takes care about communication details to make focus on business logic. It is based on Asio. SSL is also supported.
https://sourceforge.net/projects/libunicomm/files/latest/download?source=directory
http server example:
http://www.boost.org/doc/libs/master/doc/html/boost_asio/examples.html#boost_asio.examples.cpp03_examples
https://github.com/eidheim/Simple-Web-Server
HTTP and WebSocket implementations built on Boost.Asio in C++11 http://vinniefalco.github.io/
https://github.com/vinniefalco/Beast
boost:http 开发中
https://github.com/BoostGSoC14/boost.http
http://lists.boost.org/boost-announce/2015/08/0452.php
https://boostgsoc14.github.io/boost.http/tutorial.html
downloading web content using a URL
http://think-async.com/Urdl/doc/html/index.html
