1 files changed, 47 insertions, 0 deletions
diff --git a/netwerk/protocol/http/EarlyHintPreconnect.cpp b/netwerk/protocol/http/EarlyHintPreconnect.cpp
new file mode 100644
index 0000000000..e4d05c073f
--- /dev/null
+++ b/netwerk/protocol/http/EarlyHintPreconnect.cpp
@@ -0,0 +1,47 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "EarlyHintPreconnect.h"
+
+#include "mozilla/CORSMode.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/StaticPrefs_network.h"
+#include "nsIOService.h"
+#include "nsIURI.h"
+
+namespace mozilla::net {
+
+void EarlyHintPreconnect::MaybePreconnect(const LinkHeader& aHeader,
+                                          nsIURI* aBaseURI,
+                                          nsIPrincipal* aPrincipal) {
+  if (!StaticPrefs::network_early_hints_preconnect_enabled()) {
+    return;
+  }
+
+  if (!gIOService) {
+    return;
+  }
+
+  nsCOMPtr<nsIURI> uri;
+  if (NS_FAILED(aHeader.NewResolveHref(getter_AddRefs(uri), aBaseURI))) {
+    return;
+  }
+
+  // only preconnect secure context urls
+  if (!uri->SchemeIs("https")) {
+    return;
+  }
+
+  // Note that the http connection manager will limit the number of connections
+  // we can make, so it should be fine we don't check duplicate preconnect
+  // attempts here.
+  CORSMode corsMode = dom::Element::StringToCORSMode(aHeader.mCrossOrigin);
+  if (corsMode == CORS_ANONYMOUS) {
+    gIOService->SpeculativeAnonymousConnect(uri, aPrincipal, nullptr);
+  } else {
+    gIOService->SpeculativeConnect(uri, aPrincipal, nullptr);
+  }
+}
+
+}  // namespace mozilla::net