[squid-users] proxy working but not the cache + curl getting 400 error

I am trying to setup Squid to be a simple proxy-cache.
I am seeing two strange behaviors.
I have 3 machines.  I am using one as my web browser, one as my
proxy-cache and the third as my web server.
When I configure my web browser (Firefox) to connect through my
proxy-cache to my web server I see content as expected, however it
does not seem to be cached.  The web page I am using is at the bottom
of this post.  When I view the web page I keep seeing the time change,
so I know that it is not being cached.
Furthermore, when I use curl to through the proxy and look at the
headers using the -D option I see a 400 error from the proxy server
and then a 200 from the web server?  I also see a message from the
squid server of "Invalid Request"

When I run my web page through
http://www.ircache.net/cgi-bin/cacheability.py it says"

This object will be fresh for 20 hr 22 min. It has a validator
present, but when a conditional request was made with it, the same
object was sent anyway.

Can anyone help?
Thanks!
I am running SQUID 2.7.STABLE3 on Ubuntu.

I have not changed the config much at all.  I did a grep of all
options that are set in the config file and have included them here:

acl all src all
acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8
acl localnet src 10.0.0.0/8     # RFC1918 possible internal network
acl localnet src 172.16.0.0/12  # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl SSL_ports port 443          # https
acl SSL_ports port 563          # snews
acl SSL_ports port 873          # rsync
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl Safe_ports port 631         # cups
acl Safe_ports port 873         # rsync
acl Safe_ports port 901         # SWAT
acl purge method PURGE
acl CONNECT method CONNECT
http_access allow manager localhost
http_access deny manager
http_access allow purge localhost
http_access deny purge
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost
http_access allow localnet
http_access deny all
icp_access allow localnet
icp_access deny all
http_port 3128
hierarchy_stoplist cgi-bin ?
access_log /var/log/squid/access.log squid
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?) 0     0%      0
refresh_pattern .               0       20%     4320
acl apache rep_header Server ^Apache
broken_vary_encoding allow apache
extension_methods REPORT MERGE MKACTIVITY CHECKOUT
hosts_file /etc/hosts
coredump_dir /var/spool/squid

-------------------------------------------------------------------------------------------

Here is the web page I am using

<?php
// the time we got hit and generated content
$now = time();
$generatedAt = gmdate('D, d M Y H:i:s T', $now);

// the last modified date (midnight on the same day of generation, as
// per your business-rule)
$lastModified = gmdate('D, d M Y 00:00:00 T', $now);

// date of expiry (24 hours after the last modified date, as per your
// business-rule)
$expiresAt = gmdate('D, d M Y H:i:s T', strtotime($lastModified) + 86400);

// the minimum required http headers to make Squid do what you asked is
// Last-modified and Cache-control.  We need to give Cache-control the
// expiry time in terms of "age" (in seconds) so we calculate that below.
// Optionally you could also provide the "Expires: $expiresAt" header to
// tell the browser/client the same information, just in a different way.
// This is not required for Squid though.
$maxAge = strtotime($expiresAt) - strtotime($generatedAt);
header('Last-modified: ' . $lastModified);
header('Cache-control: max-age=' . $maxAge);
header ('Expires: '.$expiresAt);

// The rest is simply informational
header('Content-type: text/plain');
echo "The content of this page was last modified at $lastModified\n";
echo "This page was generated at $generatedAt and will be cached by
Squid for $maxAge seconds until $expiresAt\n";
?>
Received on Wed Mar 11 2009 - 03:44:27 MDT