error_message_format¶

QuietRequestHandler.error_message_format = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"\n "http://www.w3.org/TR/html4/strict.dtd">\n<html>\n <head>\n <meta http-equiv="Content-Type" content="text/html;charset=utf-8">\n <title>Error response</title>\n </head>\n <body>\n <h1>Error response</h1>\n <p>Error code: %(code)d</p>\n <p>Message: %(message)s.</p>\n <p>Error code explanation: %(code)s - %(explain)s.</p>\n </body>\n</html>\n'¶