Why can't every web server just remember (index) all the content that it serves? Much like resolving DNS queries, I could then ask every server near me for spe

Why can't every web server just remember (index) all the content that it serves? Much like resolving DNS queries, I could then ask every server near me for specific terms. If they serve that content, they'll return a list of links containing those search terms. We could have different apps with different algorithms to sort the bare results according to the criteria that's most relevant to each individual user.