APR(Apache portable Run-time libraries，Apache可移植运行库)的目的如其名称一样，主要为上层的应用程序提供一个可以跨越多操作系统平台使用的底层支持接口库。在早期的Apache版本中，应用程序本身必须能够处理各种具体操作系统平台的细节，并针对不同的平台调用不同的处理函数。随着Apache的进一步开发， Apache组织决定将这些通用的函数独立出来并发展成为一个新的项目。这样，APR的开发就从Apache中独立出来，Apache仅仅是使用APR而已。-APR (Apache portable Run-time libraries, Apache Portable Runtime library) if the purpose of the same name. mainly for the upper application can provide a number of operating system platforms across the bottom to support the use of the interface. Early in the Apache versions, Application of the process itself must be able to address specific details of the operating system platform, According to different platforms different call handling functions. Along with the further development of the Apache. Apache organization decided to generic function independent of and develop into a new project. Thus, the development of the APR from independent Apache, Apache APR is only used it.