If policy is expired, any existing HSTS policy for its host will be removed
instead. If a policy existed for this host, it will be replaced. Otherwise,
the new policy will be inserted. If the policy is a session policy, that is,
one created with soup.hstspolicy.HSTSPolicy.newSessionPolicy, the policy will not
expire and will be enforced during the lifetime of hsts_enforcer's
classSession.
Sets policy to hsts_enforcer.
If policy is expired, any existing HSTS policy for its host will be removed instead. If a policy existed for this host, it will be replaced. Otherwise, the new policy will be inserted. If the policy is a session policy, that is, one created with soup.hstspolicy.HSTSPolicy.newSessionPolicy, the policy will not expire and will be enforced during the lifetime of hsts_enforcer's classSession.