Apache Portable Runtime
Developer(s)Apache Software Foundation
Stable release
1.7.4 / April 16, 2023; 15 months ago (2023-04-16)[1]
Written inC
Operating systemCross-platform
TypeDevelopment library
LicenseApache License 2.0

The Apache Portable Runtime (APR) is a supporting library for the Apache web server. It provides a set of APIs that map to the underlying operating system (OS).[2] Where the OS does not support a particular function, APR will provide an emulation. Thus programmers can use the APR to make a program truly portable across platforms.

APR originally formed a part of Apache HTTP Server, but the Apache Software Foundation spun it off into a separate project. Other applications can use it to achieve platform independence.


The range of platform-independent functionality provided by APR includes: [3]

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  1. ^ "Apache Portable Runtime APR 1.7.4 Released". Retrieved 7 October 2023.
  2. ^ Stable Apache Release Hits, Sean Michael Kerner, 2 December 2005, "Apache Portable Runtime (APR) 1.0 API, which provides libraries that interface between the underlying operating system and the server."
  3. ^ "Apache Portable Runtime modules". Apache. Retrieved 23 September 2023.
  4. ^ "ACE and TAO Success Stories". Archived from the original on 29 August 2008. Retrieved 2008-07-31.