Detecting CNAME without having implementation in network stack

[Luke Seunghoe Gu]

Hi,

I'm trying to find a way to detect CNAME(canonical name) for a page loading without having implementation in network stack.

I found one from NavigationHandle.

https://source.chromium.org/chromium/chromium/src/+/main:content/public/browser/navigation_handle.h;l=60;drc=345ca36745fcd18c97ac6dad6a1437a51dcbeb3e;bpv=1;bpt=1

and it refers to UrlReponseHead.

https://source.chromium.org/chromium/chromium/src/+/main:services/network/public/mojom/url_response_head.mojom;l=218;drc=03ffb6f7e48e9ad00f07d1e0ba28bda4bae5625e;bpv=0;bpt=1

so It's possible to detect CNAME for frame navigations (main, sub) through WebContentsObserver. For example:

https://source.chromium.org/chromium/chromium/src/+/main:content/public/browser/web_contents_observer.h;l=97;bpv=1;bpt=1?q=webcontentsobserver&ss=chromium%2Fchromium%2Fsrc

However, detecting CNAME for subresources is not possible with the above way.

I know that all the loading complete can be caught from WebCotentsObserver::ResourceLoadComplete() but I cannot find the way to get CNAME list from it. 

Is there any way of it?

Thank you.