How we can get the response header in Exoplayer.

Actual I am using Exoplayer v2  and on LA_Url request i have to read response header but did not find any way to achieve it.
Also need to acess every response header to stop the video at specific header value.     
provide the solution.
While debugging i can access response using - //DataSource.connection.delegate.httpEngine.networkResponse.headers.namesAndValues;