Navigation Request Headers

[Giovanni Ortuño]

Hi!

I'm trying to gather metrics about the size of top level requests, including the size of the request line, the size of the headers, etc. Any pointers to where I could get this data in chromium?

I've looked at NavigationHandle but the HttpRequestHeader member is missing a lot of headers that show up in DevTools, e.g. the Cookie header. I tried to look at what DevTools does to get all the headers but couldn't figure it out.

Any pointers would be really appreciated!

Gio

[Nasko Oskov]

Hey Gio,

I don't have a good answer to your question, as I haven't looked at this area in a long time and haven't had a chance to look under the debugger, but I would expect to see most headers in the BeginNavigationParams struct which has a headers member. For example, a bunch of headers get populated here - https://source.chromium.org/chromium/chromium/src/+/main:content/browser/renderer_host/navigation_request.cc;l=1922-2009;drc=5203366d4cf174b9331ee33563e0520f10b60828.

In general, I would expect there is also a hook in the network stack you can use, but you didn't specify whether you need this in a specific component/layer of the code.

Thanks!

Nasko

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[Giovanni Ortuño]

Thanks for the pointers, Nasko!

Unfortunately, BeginNavigationParams is missing some headers that seemed to be added further down the stack.

I was able to get the information through UrlLoader::SetRawRequestHeadersAndNotify() which gets called after the headers I need, e.g. Cookie, get built way further down the stack.

Thanks again!

Gio