Luke Wilde 210c3795f9 LibWeb: Apply content filter to DNS prefetch and pre-connect ...

Performing DNS prefetch or pre-connect on filtered URLs is wasteful,
as we would block any actual use further down the line.

A bunch of websites perform DNS prefetch and/or pre-connect to trackers
as well, for example:
```
prefetch DNS for 'https://adserver-us.adtech.advertising.com/'
prefetch DNS for 'https://secure.adnxs.com/'
prefetch DNS for 'https://bidder.criteo.com/'
prefetch DNS for 'https://static.criteo.net/'
prefetch DNS for 'https://cdn.krxd.net/'
prefetch DNS for 'https://widgets.outbrain.com/'
prefetch DNS for 'https://images.outbrain.com/'
prefetch DNS for 'https://log.outbrain.com/
prefetch DNS for 'https://amplifypixel.outbrain.com/'
prefetch DNS for 'https://odb.outbrain.com/'
prefetch DNS for 'https://js-sec.indexww.com/'
prefetch DNS for 'https://as-sec.casalemedia.com/'
prefetch DNS for 'https://as.casalemedia.com/'
prefetch DNS for 'https://sofia.trustx.org/'
prefetch DNS for 'https://c.amazon-adsystem.com/'
prefetch DNS for 'https://s.amazon-adsystem.com/'
prefetch DNS for 'https://aax.amazon-adsystem.com/'
prefetch DNS for 'https://t.teads.tv/'
prefetch DNS for 'https://beacon.krxd.net/'
pre-connect to 'https://www.google-analytics.com/'
pre-connect to 'https://www.googletagmanager.com/'
```

2022-06-10 12:15:37 +01:00

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