What's happening on meteor_runtime_config?

I’ve recently upgrade to 1.4 and found meteor_runtime_config.js is gone.
it has been embedded in the index.html(any document) with inline script tag.

I’m using nginx proxy and cache.

as you may know, if there is a difference with DDP server in the version info in __meteor_runtime_config__, hot code push occurs and if it fails to reload the __meteor_runtime_config__, it will continuously keep reloading.
I am dealing with my cache problem for months and I need to change the cache policy again.

Could anyone tell me what the change is for?
and I want to know what is the best practice for caching for Meteor.

Sorry, nothing was happening there.

it was embedded when inlineScriptsAllowed is true.