From: Tom Lane <tgl@sss.pgh.pa.us>
To: Julien Rouhaud <rjuju123@gmail.com>
cc: Antoine <plaskowski.stanislas@gmail.com>, pgsql-bugs@lists.postgresql.org
Subject: Re: Windows locale cause server to send invalid data encoding to
 client
In-reply-to: <20210714135052.bg5ywhl7p23tnjmg@nol>
References: 
 <CAO16vDNM5_eUZG3unbumx2AJt11VZxuQxn9cSZ9VhSCpD1TMgw@mail.gmail.com>
 <20210714135052.bg5ywhl7p23tnjmg@nol>
Comments: In-reply-to Julien Rouhaud <rjuju123@gmail.com>
	message dated "Wed, 14 Jul 2021 21:50:52 +0800"
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Date: Wed, 14 Jul 2021 10:19:59 -0400
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Julien Rouhaud <rjuju123@gmail.com> writes:
> On Wed, Jul 14, 2021 at 01:49:24PM +0200, Antoine wrote:
>> I set up a postgresql server on Windows 10 and connected it using Rust,=
 but
>> the Rust client reports invalid UTF-8 data when the password is wrong. =
I
>> use a french locale windows that contain some accents "=C3=A9=C3=A8=C3=AA=
" etc.

> This is unfortunately working as designed.  The client encoding can't be=
 set
> during startup (and authentication is part of it), see
> https://github.com/postgres/postgres/blob/master/src/backend/utils/mb/mb=
utils.c#L85-L88
> for more details about it:

It seems like the core problem is that the "authentication failed" error
text may be sent in an unexpected encoding.  I wonder if we should decline
to translate any error messages until we've established the requested
client encoding.  Sending the message in English isn't ideal either,
but it'd avoid this hazard.

			regards, tom lane