Manifest URLs must start with a protocol (for example, <code>http://</code> or <code>https://</code>) and typically use the <code>.webapp</code> extension.
Manifestuen URLek protokolo batekin hasi behar dute adibidez, <code>http://</code> edo <code>https://</code>) eta normalean <code>.webapp</code> luzapena erabiltzen dute.