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Code Issues Releases Wiki Activity

Make use of X-DNS-Prefetch-Control in Chromium-based browsers

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Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/548

The fix applies only to Chromium-based browsers -- a
`X-DNS-Prefetch-Control` header[1] will be unconditionally
injected when uBO's "Disable pre-fetching" setting is
enabled (it is by default).

This is a mitigation, this does not completely fix the issue
of the setting "Disable pre-fetching" being disregarded on
Chromium-based browsers when sites use
`preconnect`/`preload`.

[1] https://developer.mozilla.org/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control
This commit is contained in:
Raymond Hill 2019-04-27 13:12:33 -04:00
parent acb12d2a1d
commit 367cdd6666
No known key found for this signature in database
GPG Key ID: 25E1490B761470C2
2 changed files with 41 additions and 1 deletions
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6
platform/chromium/vapi-background.js
View File

@ -223,8 +223,9 @@ vAPI.browserSettings = (function() {
}
switch ( setting ) {
case 'prefetching':
const enabled = !!details[setting];
try {
if ( !!details[setting] ) {
if ( enabled ) {
chrome.privacy.network.networkPredictionEnabled.clear({
scope: 'regular'
}, vAPI.resetLastError);
@ -237,6 +238,9 @@ vAPI.browserSettings = (function() {
} catch(ex) {
console.error(ex);
}
if ( vAPI.prefetching instanceof Function ) {
vAPI.prefetching(enabled);
}
break;
case 'hyperlinkAuditing':

36
platform/chromium/vapi-webrequest.js
View File

@ -195,3 +195,39 @@ vAPI.net.onBeforeReady = vAPI.net.onBeforeReady || (function() {
})();
/******************************************************************************/
// https://github.com/uBlockOrigin/uBlock-issues/issues/548
// Use `X-DNS-Prefetch-Control` to workaround Chromium's disregard of the
// setting "Predict network actions to improve page load performance".
vAPI.prefetching = (function() {
let listening = false;
const onHeadersReceived = function(details) {
details.responseHeaders.push({
name: 'X-DNS-Prefetch-Control',
value: 'off'
});
return { responseHeaders: details.responseHeaders };
};
return state => {
const wr = chrome.webRequest;
if ( state && listening ) {
wr.onHeadersReceived.removeListener(onHeadersReceived);
listening = false;
} else if ( !state && !listening ) {
wr.onHeadersReceived.addListener(
onHeadersReceived,
{
urls: [ 'http://*/*', 'https://*/*' ],
types: [ 'main_frame', 'sub_frame' ]
},
[ 'blocking', 'responseHeaders' ]
);
listening = true;
}
};
})();
/******************************************************************************/