# API

常规TCP与程序最成功的因素之一便是标准化的套接字（socket）API。其API有着定义良好的功能，使用它能让你轻松地在各操作系统之间移植程序，因为TCP采用同样的方式运作。

但QUIC不是如此。QUIC目前没有标准化的API。

使用QUIC时，你需要选择一个现有的库实现，并坚持使用它的API。这在某种程度上把应用“绑定”到了单一的库上。换库意味着使用另外一套API，这可能带来相当的工作量。

另外，由于QUIC一般在用户空间中实现，所以它不像现有的TCP和UDP套接字API那样能轻松扩展。使用QUIC意味着选择了套接字API之外的另一套API。


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