Re: [squid-users] caching uniface dynamic pages

From: Henrik Nordstrom <>
Date: Fri, 30 Mar 2001 16:54:24 +0200

selvatico patrice wrote:

> 985961658.367 4789 TCP_MISS/200 99293 GET
> ID=VN - DIRECT/ text/html [

    If-Modified-Since: Fri, 30 Mar 2001 10:00:00 GMT; length=98921
    Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,
image/png, */*
    User-Agent: Mozilla/4.75 %5ben%5d (WinNT; U)
    Accept-Encoding: gzip
    Accept-Language: fr,en
    Accept-Charset: iso-8859-1,*,utf-8

] [
    HTTP/1.1 200 OK
    Date: Fri, 30 Mar 2001 14:14:13 GMT
    Server: Apache/1.3.19 (Unix) ApacheJServ/1.1.2
    Cache-Control: no-cache
    Expires: 0
    Cache-Control: public, max-age=600
    Last-Modified: Thu, 30 Mar 2001 10:00:00 GMT
    Expires: Thu, 31 Mar 2001 10:00:00 GMT
    Content-Length: 98921
    Keep-Alive: timeout=15, max=100
    Connection: Keep-Alive
    Content-Type: text/html


> It seems that I have 2 Cache-Control in my header:

And a bad Expires: header.

> I use mod_header in apache :
> Header unset Cache-Control
> Header set Cache-Control "public, max-age=600"
> Header set Last-Modified "Thu, 30 Mar 2001 10:00:00 GMT"
> I tried only to put only that
> Header unset Cache-Control
> But I still have the Cache-Control: no-cache in the header .

The "Cache-Control: no-cache", and "Expires: 0" headers are most likely
added by the uniface software to prevent caching of returned pages.
Without getting rid of these it will be very hard to get Squid to cache
the result...

How do uniface plug into Apache? As a Apache module, JServ or as a CGI

Note: The question on how to get uniface to output cache friendly
documents belongs more on a uniface or mailing list than here..

If all else fails, you might be able to recode Squid to ignore those
headers, but it is very much preferred if the problem can be addressed
at the origin server. (often when such hacks are added to Squid people
think they are smart and starts abuse them to improve the hit ratio in
proxies, often without understanding what they are doing, then
complaining when things break in bad ways for the users)

Henrik Nordstrom
Squid hacker
Received on Fri Mar 30 2001 - 07:52:19 MST

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