Support ALPS extension #1987
Description
Issue Details
The problem is that CoreLibs currently does not "copy" the ALPS extension from server to client:
https://vasilvv.github.io/httpbis-alps/draft-vvv-httpbis-alps.html
This may (and probably does) cause issues with some anti-DDOS and antibot systems as they may rely on ALPS to force the browser to send client hints:
https://datatracker.ietf.org/doc/html/draft-davidben-http-client-hint-reliability#section-4
So in the case of AdGuard they will send ALPS, CoreLibs won't pass it to the browser, the server won't receive client hints and will consider us a bot instead of a legitimate browser.
Proposed solution
Support ALPS and pass it to the client.
We may need to filter it and only pass what we can support.
Alternative solution
No response