Strange caching behavior

[Rodrigo Benzaquen]

Hi guys, today we saw that if our backend servers doesn´t add an HTTP
CACHE-CONTROL Varnish cache the URL for 30s.

 

We have tested the same using Netcache and we noticed that Netcache doesn´t
cache the object. 

 

Do you guys know how to modify Varnish to don´t cache URLs or Objects that
doesn´t have CACHE-CONTROL?

 

 

Example: as you can see our Backend Server is not sending cache-control:
no-cache and Varnish is caching the object for 30s.

 

 

 


VARNISH

	
		

(Request-Line)

GET /jm/XXXXXX?go=trans HTTP/1.1


Accept

image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,
application/x-ms-application, application/vnd.ms-xpsdocument,
application/xaml+xml, application/x-ms-xbap, application/x-shockwave-flash,
application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword,
*/*


Accept-Encoding

gzip, deflate


Accept-Language

es-ar


Connection

Keep-Alive


Cookie

poison_cookie=313537500; orguseridp=88011902


Host

www.XXX.XX


Referer

http://XXX.XXX.XX


UA-CPU

x86


User-Agent

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR
2.0.50727; .NET CLR 3.0.04506)

		
		

(Status-Line)

HTTP/1.1 302 Found


Age

28


Connection

keep-alive


Content-Length

619


Date

Thu, 25 Jun 2009 12:38:03 GMT


Location

https://www.xxxx.xxx?go=trans&redirected=Y&setCKorgpago=89482244&setCK__utma
=1.3637389798933187000.1242304103.1242310216.1242349919.3&setCKPMS78987160=P
MS78987160&setCKpmsword=ITEM&setCKtr_cookie=187.13.29.68&setCKorgnickp=SELL-
SHOP&setCKpmsctx=*****SMEMORIA+DDR400%7CS1+GB+DDR+400%7CS512+DDR+400%7C&setC
Korgpms=305868&setCKorghash=062508-S4EZVST0K3VSOVBLL86MY7JOG4K5BU-89482244&s
etCKorguseridp=89482244&setCKorguserid=h749Th7ZZTT&setCKpoison_cookie=313426
119&setCK__utmz=1.1242304103.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(non
e)&setCKoasLoConoce=Y


Server

Resin/3.0.18


via

1.1 Varnish (yblvarnish4)


X-Varnish

1935462643 1935458287

 

 

Thanks

Rodrigo.

 

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