Our limit of 8k for a single header field was too small for certain
services which returned Location values or WWW-Authenticate challenges
longer than 8k.
Instead, taking inspiration from Chromium, we have a limit of 250k for
the full header itself. And increasing our field limit to 100k, which
would occupy almost half of what the total header allows.
Also took the opportunity to make it adjustable from the outside so we
can set more strict limits in other components.
Fixes: QTBUG-104132
Pick-to: 6.3 6.4
Change-Id: Ibbe139445e79baaef30829cfbc9a59f884e96293
Reviewed-by: Ievgenii Meshcheriakov <ievgenii.meshcheriakov@qt.io>
e3ea1d02e6