sw-precache: don't fallback if URL starts with /api

Author: BDav24

Diff for: packages/react-scripts/config/webpack.config.prod.js

@@ -340,7 +340,7 @@ module.exports = {
       navigateFallback: publicUrl + '/index.html',
       // Ignores URLs starting from /__ (useful for Firebase):
       // https://github.com/facebookincubator/create-react-app/issues/2237#issuecomment-302693219
-      navigateFallbackWhitelist: [/^(?!\/__).*/],
+      navigateFallbackWhitelist: [/^(?!\/(__|api)).*/],
       // Don't precache sourcemaps (they're large) and build asset manifest:
       staticFileGlobsIgnorePatterns: [/\.map$/, /asset-manifest\.json$/],
     }),