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LibWeb: Apply content filter to DNS prefetch and pre-connect

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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/'
```
This commit is contained in:
Luke Wilde 2022-06-10 11:53:43 +01:00 • committed by Linus Groh
parent 4c77575ec5
commit 210c3795f9
1 changed files with 10 additions and 0 deletions
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10
Userland/Libraries/LibWeb/Loader/ResourceLoader.cpp
View file

@ -61,11 +61,21 @@ ResourceLoader::ResourceLoader(NonnullRefPtr<ResourceLoaderConnector> connector)
void ResourceLoader::prefetch_dns(AK::URL const& url)
{
if (ContentFilter::the().is_filtered(url)) {
dbgln("ResourceLoader: Refusing to prefetch DNS for '{}': \033[31;1mURL was filtered\033[0m", url);
return;
}
m_connector->prefetch_dns(url);
}
void ResourceLoader::preconnect(AK::URL const& url)
{
if (ContentFilter::the().is_filtered(url)) {
dbgln("ResourceLoader: Refusing to pre-connect to '{}': \033[31;1mURL was filtered\033[0m", url);
return;
}
m_connector->preconnect(url);
}