Redirecting to https on all of

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W3C's main web site has been available via https for over a decade, but until now we have not been redirecting all requests to https as is commonly done on most other sites.

The primary reason for this is that we wanted to avoid causing issues for software requesting machine-readable resources from such as HTML DTDs, XML Schemas, and namespace documents.

We believe enough time has passed for most such software to have been updated to handle redirects and https, so we are planning to start redirecting all requests received over http to https within a month or two.

In order to discover any potential remaining issues and to give some advance notice in case there are software systems that still have issues with redirects and https, we plan to conduct some limited tests before fully deploying this change to our site, where we redirect all http traffic to https for a few hours at a time.

The first such test is planned for Monday August 1, for 8 hours starting at 14:00 UTC (14:00 UTC to 22:00 UTC)

Update 16 Aug 2022: The second test is planned to run from Thursday August 18 to Sunday August 21, for 72 hours starting at 14:00 UTC on Thursday.

Update 19 Aug 2022: We ended the second test early, at 17:30 UTC today due to several complaints that this change was impacting production services. We plan to conduct another test in two weeks, for 48 hours starting at 17:00 UTC on Sep 1, ending at 17:00 UTC Sep 3. If you have dependencies on our web site in your production services please work to remove them, or update them to handle redirections and https.

If you have any questions or comments about this planned change, please post a comment here or contact us by email at

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