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This page
http://livereload.com/extensions/
Has a dead link to
http://feedback.livereload.com/knowledgebase/articles/86174-livereload-protocol
The last entry on the wayback machine is here
https://web.archive.org/web/20170430032744/http://feedback.livereload.com/knowledgebase/articles/86174-livereload-protocol