Turns out it was a few problems, for anyone reading this if you use the shopify koa app and implement server.use to serve static files make sure you implement it before createShopifyAuth as requests to /a/proxy/manifest.json for example will attempt ...

Could be something to do with this, notice that content-encoding is stripped from the header, https://stackoverflow.com/questions/48931350/content-encoding-header-not-returned-from-cloudfront

Hi I've developed a custom app that simply serves static files for PWA features , which is served at , https://cb.pwa.mcjb.enterprises/d/manifest.jsonProxy configurationResponse when installed in the app.Any idea?Much appreciated Matt