Zamaneh Media is about to release the 451 Tools plugin for WordPress, putting turn-key censorship mitigation strategies in the hands of every WordPress website administrator.
The 451 Tools plugin for WordPress depends on the More Mirrors Javascript library. This library implements that client-side proxy responsible for the offline fallback strategies made available by the plugin.
The Javascript library is already available on npmjs.org, alongside the API documentation for front-end Javascript developers that would like to do a custom implementation of the client-side proxy.