[HttpFoundation] removed wrong HTTP header
Merge branch '2.3' into 2.5

* 2.3:
  [travis] reorder matrix + prevent "Killed" jobs
  [HttpFoundation] removed wrong HTTP header
Merge branch '2.5' into 2.6

* 2.5:
  [travis] reorder matrix + prevent "Killed" jobs
  [HttpFoundation] removed wrong HTTP header