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Enhance DNS prefetching by resolving URIs against the document base URI

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wuggy 2026-04-23 22:19:46 -07:00
commit b913fa62d9
1 changed files with 12 additions and 9 deletions
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21
dom/base/nsContentSink.cpp
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@ -923,15 +923,15 @@ nsContentSink::PrefetchDNS(const nsAString &aHref)
{
nsAutoString hostname;
if (StringBeginsWith(aHref, NS_LITERAL_STRING("//"))) {
hostname = Substring(aHref, 2);
}
else {
nsCOMPtr<nsIURI> uri;
NS_NewURI(getter_AddRefs(uri), aHref);
if (!uri) {
return;
}
// Resolve against the document base URI so relative and scheme-relative
// Link header values can still extract a hostname for speculation.
const nsACString& charset = mDocument->GetDocumentCharacterSet();
nsCOMPtr<nsIURI> uri;
NS_NewURI(getter_AddRefs(uri), aHref,
charset.IsEmpty() ? nullptr : PromiseFlatCString(charset).get(),
mDocument->GetDocBaseURI());
if (uri) {
nsresult rv;
bool isLocalResource = false;
rv = NS_URIChainHasFlags(uri, nsIProtocolHandler::URI_IS_LOCAL_RESOURCE,
@ -941,6 +941,9 @@ nsContentSink::PrefetchDNS(const nsAString &aHref)
uri->GetHost(host);
CopyUTF8toUTF16(host, hostname);
}
} else if (aHref.FindChar('/') == kNotFound && aHref.FindChar(':') == kNotFound) {
// Support a bare hostname token in Link headers.
hostname = aHref;
}
if (!hostname.IsEmpty() && nsHTMLDNSPrefetch::IsAllowed(mDocument)) {