[squid-users] Squid behaviour with gzip responses from origin server

Hi All,

I am using Squid 3.1.16.
I had modified the request header in Squid to include: "Accept-Encoding:
gzip".

The request is also sent to the Apache server. The server seems to even
compress the object and return with proper headers.

But the squid seems to drop the "content-encoding" header. It also seems to
drop the content-length header.

I am not able to understand why Squid replaces the Content-Encoding header
with something else and why it was marking as internal?

These are my tcpdumps for the request and response from the Apache:

Request sent to Apache (tcpdump)
----------------------------------
GET./compres
s.html.HTTP/1.1.
.User-Agent:.Wge
t/1.12.(linux-gn
u)..Accept:.*/*.
.Host:.10.145.66
.205..Referer:.h
ttp://10.145.66.
205/fetchcompres
s.html..Accept-E
ncoding:.gzip..V
ia:.1.1.prefetch
.net.(squid/3.1.
16)..X-Forwarded
-For:.unknown..C
ache-Control:.ma
x-age=259200..Co
nnection:.keep-a
live....

Reply header as sent by Apache (tcpdump)
HTTP/1.1.200
 .OK..Date:.Wed,.
 17.Apr.2013.02:1
 3:13.GMT..Server
 :.Apache/2.2.15.
 (Red.Hat)..Last-
 Modified:.Wed,.1
 7.Apr.2013.01:21
 :00.GMT..ETag:."
 1208df-282-4da84
 4c80d89e"..Accep
 t-Ranges:.bytes.
 .Vary:.Accept-En
 coding..Content-
 Encoding:.gzip..
 Content-Length:.
 125..Connection:
 .close..Content-
 Type:.text/html;
 .charset=UTF-8..

Reply header (as given by Squid) after it receives data from Apache
-----------------------------------------------------------------
HTTP/1.0 200 Internal marker object
Server: squid/3.1.16
Mime-Version: 1.0
Date: Wed, 17 Apr 2013 07:16:30 GMT
Content-Type: x-squid-internal/vary
Expires: Thu, 18 Apr 2013 11:03:10 GMT
Vary: Accept-Encoding

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