playframework 2.0 - How to set the header of a response in production mode in play 2 -

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i made website lets users upload images , serves them back. lower load i've tried use client side caching so:

byte[] data = files.readallbytes(path); response().setheader(cache_control, "max-age=3600"); response().setheader(etag, image); return ok(data);

this works fine in development mode (play run) when run site in production mode headers gone , nothing cached.

thanks


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