Subject: bug#15985: Cause of the error...

From: Eli Zaretskii <[email-masked]>
Date: Fri, 13 Dec 2013 13:05:08 +0200

> From: Andreas Schwab <[email-masked]>
> Date: Fri, 13 Dec 2013 11:58:19 +0100
> Cc: [email-masked]
> 
> Donald Curtis <[email-masked]> writes:
> 
> > And what shows up as the first line of the buffer is:
> > ^_\213^H^@^@^@^@^@^@^C^C^@^@^@^@^@^@^@^@^@HTTP/1.1 200 OK^M
> 
> That the header of an empty gzip stream.

So maybe zlib-decompress-region is involved in some way?