A visitor could visit a web page having a lang in its context that is
not installed in the databased he is connected to. The problem is that
visitors are not logged-in thus it is not possible to determine their
lang via their `res.users` preferences. The lang used instead is the
lang set in the `Accept-Language` header of the incoming request, that
header is set by various browsers in accordance to the user system
preferences or browser settings.
The browser lang (`Request.best`) is only parsed according to the
`babel` database, it is a lang syntactically speaking but not necessary
a lang that is installed in the database.
At the moment the browser lang is set in the context (inside of
`Request._get_dbname_and_session`), it is not possible to verify it is
installed in the database as no connection to any database as been
established yet. Instead the lang is validated inside of
`ir.http._pre_dispatch` which is the method responsible to prepare/fix
various stuff on the request/session/context.
In regard to 93b684d3c7, we prefer to fallback on English, hence the
modification in `get_lang`.
closesodoo/odoo#116683
Reference-to: 93b684d3c7 ([FIX] base: lang should fallback on english instead of arab)
X-original-commit: 743e97667e44cdaab6db334d807cf3d409cea621
Signed-off-by: Julien Castiaux (juc) <juc@odoo.com>
Julien Castiaux
ca5ca24bc6