gistfile1.rb

    def call(env)
      @render_pdf = false
      set_request_to_render_as_pdf(env) if env['PATH_INFO'].match(/\.pdf$/)
      
      status, headers, response = @app.call(env)
      
      request = Rack::Request.new(env)
      if @render_pdf && headers['Content-Type'] =~ /text\/html|application\/xhtml\+xml/
        body = response.body
        
        body = translate_paths(body, env)
        
        pdf = PDFKit.new(body, @options)

        puts "PDFKit OBJECT CREATED"

        body = pdf.to_pdf

        puts "PDF BODY CONVERTED"
        
        # 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"
        
        response = [body]

        puts "FINISHING UP"
      end
      
      puts "RETURNING RESPONSE"
      [status, headers, response]
    end