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微服务调用为啥用RPC框架，Http不更简单吗？
source link: http://developer.51cto.com/art/201905/595840.htm
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在一次的面试交谈中，聊到业务实现的技术架构。不管系统大小，一般都是微服务的架构，所以就产生了一个问题，为什么服务之间调用，选择用RPC，http 不也能实现服务之间的通信吗?怎么不用呢?或者 RPC 比 http 好在哪里?
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