simple toy http server
##todo list
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todo mmap 返回文件资源
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todo 对mmap进一步包装缓存，减少磁盘IO
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todo 测试加不加超时timer的影响
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todo 调试目前性能表现较差的原因
Benchmarking: GET http://localhost:23333/ 20000 clients, running 5 sec.
Speed=206460 pages/min, 385821 bytes/sec. Requests: 16458 susceed, 747 failed.