[8.x] Support a proxy URL for mix hot #38118
Merged
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Detect new ENV variable; Useful if you're serving a local app with ngrok, to change the url that gets output if in hot mode.
My use case: shopify app being built, react front end. Making live tweaks to the app and want to see them reflected inside the shopify interface. Running on ngrok to make local dev possible. Was manually changing app url's back and forth, but this makes things a lot easier.