class Sinatra::Base

def call!(env) # :nodoc:
  @env      = env
  @request  = Request.new(env)
  @response = Response.new
  @params   = indifferent_params(@request.params)
  template_cache.clear if settings.reload_templates
  force_encoding(@request.route)
  force_encoding(@params)
  @response['Content-Type'] = nil
  invoke { dispatch! }
  invoke { error_block!(response.status) }
  unless @response['Content-Type']
    if body.respond_to?(:to_ary) and body.first.respond_to? :content_type
      content_type body.first.content_type
    else
      content_type :html
    end
  end
  status, header, body = @response.finish
  # Never produce a body on HEAD requests. Do retain the Content-Length
  # unless it's "0", in which case we assume it was calculated erroneously
  # for a manual HEAD response and remove it entirely.
  if @env['REQUEST_METHOD'] == 'HEAD'
    body = []
    header.delete('Content-Length') if header['Content-Length'] == '0'
  end
  [status, header, body]
end