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_hsts_policy_new_session_policy(), the policy
will not expire and will be enforced during the lifetime of
@hsts_enforcer's #SoupSession.
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_hsts_policy_new_session_policy(), the policy will not expire and will be enforced during the lifetime of @hsts_enforcer's #SoupSession.