# File lib/pdfkit/middleware.rb, line 11
    def call(env)
      @request    = Rack::Request.new(env)
      @render_pdf = false

      set_request_to_render_as_pdf(env) if render_as_pdf?
      status, headers, response = @app.call(env)

      if rendering_pdf? && headers['Content-Type'] =~ /text\/html|application\/xhtml\+xml/
        body = response.respond_to?(:body) ? response.body : response.join
        body = body.join if body.is_a?(Array)
        body = PDFKit.new(translate_paths(body, env), @options).to_pdf
        response = [body]

        # Do not cache PDFs
        headers.delete('ETag')
        headers.delete('Cache-Control')

        headers["Content-Length"]         = (body.respond_to?(:bytesize) ? body.bytesize : body.size).to_s
        headers["Content-Type"]           = "application/pdf"
      end

      [status, headers, response]
    end