资源限制也是一个问题。 通常，浏览器都会限制对单个服务器的并发HTTP连接的数量，以避免对该服务器（或者网络连接）造成过大的压力。
The other problem is resource-based; generally, browsers limit the number of concurrent HTTP connections to a single server to avoid overbearing the server (or the network link).
大量并发的短生命周期连接不会造成问题。
A large number of subsequent short-lived connections is no problem.
第三部分讨论处理大量同时存在的TCP连接需要过量的线程的问题，改进了在第二部分提出的方案，提出了平衡负荷线程池的并发模式。
Thirdly, this thesis discusses the issues during large number of concurrent TCP connections. The concurrency mode described in the second part is improved to a new solution: balanced load thread pool.
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