In order to promote efficient access to W3C content the W3C Webmaster Team has deployed mirrors on several continents: North America, Asia, Europe.
This document is out-of-date and needs review by W3C.
Presently all mirrors are under the control of the W3C. W3C is currently not granting permission to other parties to run mirrors of W3C sites. You are welcome to maintain copies of W3C resources as outlined in our W3C Document License.
Some of the challenges to mirroring include:
Caching of W3C materials should comply with the "maximum time to live" information provided with the materials. After such materials have expired they should not be served from shared caches without first validating the contents of the W3C Site. For more on HTTP caching, see RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1.