varnish don't resolve ESI in my localhost - apache

Question

varnish don't resolve ESI in my localhost:
i have similar configuration like other users in apache, but i send/get following headers:
Server Apache/2.2.21 (Debian)
X-Powered-By PHP/5.3.8-2
Content-Encoding gzip
Edge-Control cache-maxage=31536000s
Cache-Control public, max-age=31536000
Pragma public
Expires Tue, 30 Oct 2012 11:41:15 GMT
ProcessID 3918
Etag c2e6665981c6441ab860d12a6853a002
Vary Accept-Encoding
Content-Type text/html; charset=UTF-8
Content-Length 4193
Date Mon, 31 Oct 2011 10:40:54 GMT
X-Varnish 630755530
Age 0
Via 1.1 varnish
Request Headersview source
Host i.host.com
User-Agent Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1 Iceweasel/7.0.1
Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language en-us,en;q=0.5
Accept-Encoding gzip, deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Connection keep-alive
Cookie OAX=1I6M006JYzwABwNj; __utma=164510763.315921951.1317626740.1319722611.1319795071.39; __utmz=164510763.1317626740.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); __utma=229641156.678788339.1317628577.1320057939.1320060143.19; __utmz=229641156.1317628577.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); lang=es; __utmc=229641156; __utmb=229641156.4.10.1320060143
If-None-Match c2e6665981c6441ab860d12a6853a002
Cache-Control max-age=0
other user example that works:
Server Apache/2.2.4 (Win32) PHP/5.3.5
X-Powered-By PHP/5.3.5
Set-Cookie lang=es; expires=Mon, 31-Oct-2011 11:46:01 GMT; path=/
Edge-control cache-maxage=31536000s
Cache-Control public, max-age=31536000
Pragma public
Expires Tue, 30 Oct 2012 10:46:01 GMT
ProcessID 3824
Etag f9dcd4b1ec3f40e6763e80a3ba195de3
Content-Type text/html; charset=UTF-8
Transfer-Encoding chunked
Date Mon, 31 Oct 2011 10:46:01 GMT
X-Varnish 630755925
Age 0
Via 1.1 varnish
Connection keep-alive
Cabeceras de la peticiónver fuente
Host t.host.com
User-Agent Mozilla/5.0 (Windows NT 5.1; rv:5.0) Gecko/20100101 Firefox/5.0
Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language es-es,es;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding gzip, deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Connection keep-alive
Cookie OAX=1I6M001BiwUAB0EE; __utma=164510763.1374034467.1296142874.1319189845.1319204625.107; __utmz=164510763.1319204625.107.79.utmcsr=tamara.eitb.com|utmccn=(referral)|utmcmd=referral|utmcct=/eu/eguraldia/eskia/; __utma=261580168.2132154740.1302611206.1319197586.1320057948.90; __utmz=261580168.1302611206.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); lang=es; __utmb=261580168.1.10.1320057948; __utmc=261580168
i don't know why i receive different headers from varnish...
i get:
Content-Encoding gzip
Vary Accept-Encoding
why i get this headers and the other users no???
both have mod_deflate on...

Answer 1

you´re getting both Content-Encoding and Vary in order to Varnish, an a user-agent, properly handle the request. While Content-Encoding tells Vanish, an a user-agent, that the page content is encoded in a zip format, gzip in your case, the header Vary tells, specially Varnish to cache both versions of the page with or without gzip compression.
If backend is compression encoding aware, it can deliver a version with compression (gzip or deflate) or it can deliver a version withou any compression (text/html for example).
But, to enable ESI processing in varnish, use the esi; command on your vcl file. See this page for more information: