bug#24117: 25.1; url-http-create-request: Multibyte text in HTTP request

[Eli Zaretskii <eliz@gnu.org>]

> From: Sho Takemori <stakemorii@gmail.com>
> Date: Mon, 1 Aug 2016 08:21:39 +0900
> Cc: 24117@debbugs.gnu.org
> 
> It seems that anaconda-mode use two global variables (url-request-method and url-request-data)
> to make generate the request.
> 
> https://github.com/proofit404/anaconda-mode/blob/master/anaconda-mode.el#L349
> 
> url-request-method is bound to an ASCII string "POST".
> In my situation, url-request-data is bound to a unibyte string as below.

I don't see any non-ASCII characters in that string.  So how come it
causes the error message?

> The file contains a multibyte string "∧"

I don't see this character in the string you show.

> and anaconda-mode converts it to "\342\210\247".

Which is a correct UTF-8 encoding of that character, and should
produce a unibyte string.

To summarize, I still don't understand how come the error happened.
Could you perhaps step with Edebug into url-http-create-request, and
see what is going on there?  Or come up with a reproducible recipe of
calling url-http-create-request that I could examine on my machine?

Thanks.