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I wanted to use ClojureScript in a Spotify application (more or less a single-page application running in embedded Chromium that has access to the Spotify player and such), but found that the traditional iframe REPL transport for ClojureScript would not work cross-protocol. After learning of similar issues connecting a ClojureScript REPL to pages in non-http:// contexts, like in a Chrome browser extension, I wrote an REPL transport alternative for modern browsers with WebSockets.