def http_content_security_policy(http_server):
 return "default-src 'self' 'unsafe-inline' 'unsafe-eval'; img-src 'self' data:"

def http_content_security_policy ( http_server ) : return "default-src 'self' 'unsafe-inline' 'unsafe-eval'; img-src 'self' data:"
calculate the default content security policy string .