prepare_rep.py

from werkzeug.http import http_date

import  datetime


def prepare_response_extra_headers(include_security_headers):

    response_extra_headers = {
        # always
        'Cache-Control': 'no-cache, no-store, must-revalidate',
        'Pragma': 'no-cache',
        'Expires': '0',
        'Last-Modified': http_date(datetime.datetime.now()),
    }
    if include_security_headers:
        response_security_headers = {
            # X-Frame-Options: page can only be shown in an iframe of the same site
            'X-Frame-Options': 'SAMEORIGIN',
            # ensure all app communication is sent over HTTPS
            'Strict-Transport-Security': 'max-age=63072000; includeSubdomains',
            # instructs the browser not to override the response content type
            'X-Content-Type-Options': 'nosniff',
            # enable browser cross-site scripting (XSS) filter
            'X-XSS-Protection': '1; mode=block',
        }
        response_extra_headers.update(response_security_headers)

    return response_extra_headers