[squid-users] strange Accept-Encoding header problem

I have a squid used as reverse proxy of a apache web server.
The apache web server run module mod_deflate. when I checked
apache log file, I found that some web pages were not compressed, some were.
the Logformat is :
LogFormat "%h %l %u %t \"%r\" %>s %b %{Accept-Encoding}i
%{User-agent}i %{outstream}n/%{instream}n (%{ratio}n%%)" common

the log is like this:
192.168.0.21 - - [08/Aug/2005:22:40:01 +0800] "GET web page url" 200
19290 - Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Maxthon;
.NET CLR 1.1.4322) -/- (-%)

I found that the web page which squid send to web server does not
have Accept-Encoding headers, but the client is Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1; Maxthon; .NET CLR 1.1.4322),
whcih can probably send sent Accept-Encoding headers.

Could anyone tell me, why this happened?

Looking forward to your reply.

Best Regards,
Received on Mon Aug 08 2005 - 22:26:14 MDT