include protocol in dev server origin

src/utils/polyfillEnvironment.js

@@ -42,9 +42,14 @@ const scriptURL = require('react-native').NativeModules.SourceCode.scriptURL; //
 // or Android device it will be `localhost:<port>` but when using real iOS device
 // it will be `<ip>.xip.io:<port>`. Thus the code below ensure we connect and download
 // manifest/hot-update from a valid origin.
-const match = scriptURL && scriptURL.match(/(^.+)\/index/);
+let devServerOrigin = null;
 
-global.DEV_SERVER_ORIGIN = match ? match[1] : null;
+if (scriptURL) {
+  const [protocol, , origin]= scriptURL.split('/');
+  devServerOrigin = `${protocol}//${origin}`;
+}
+
+global.DEV_SERVER_ORIGIN = devServerOrigin;
 
 // Webpack's `publicPath` needs to be overwritten with `DEV_SERVER_ORIGIN` otherwise,
 // it would still make requests to (usually) `localhost`.