Rack::Head returns an empty body for all HEAD requests. It leaves all other requests unchanged.

Methods
C
N
Class Public methods
new(app)
# File lib/rack/head.rb, line 7
def initialize(app)
  @app = app
end
Instance Public methods
call(env)
# File lib/rack/head.rb, line 11
def call(env)
  status, headers, body = @app.call(env)

  if env[REQUEST_METHOD] == HEAD
    [
      status, headers, Rack::BodyProxy.new([]) do
        body.close if body.respond_to? :close
      end
    ]
  else
    [status, headers, body]
  end
end