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negative_t​tl not work at squid 3.1.14 ?

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hi,all

  I  just install squid 3.1.14 on centos 5 ,  and it work at http
accel mode, it can cache the reponse with right expires and age
header.

  but i found it can't cache the 404 status response (no any expires
or age header),  even i use the negative_ttl setting and delete all
refresh_pattern.

  a sample config file here:
```````````````````````````````````````````````````````````````````````
acl manager proto cache_object
acl localhost src 127.0.0.1/32 ::1
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1
acl SSL_ports port 443
acl HTTP_ports port 80
acl CONNECT method CONNECT
negative_ttl 300 seconds
acl httpwebsite dstdomain web.test.com
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access deny to_localhost
http_access allow HTTP_ports httpwebsite
http_access deny all
http_port 80 accel vhost
visible_hostname cache.test.com
unique_hostname cache.test.com
always_direct allow httpwebsite
cache_effective_user nobody
cache_effective_group nobody
hierarchy_stoplist ?
cache_mem 128 MB
cache_dir aufs /home/cache 1024 16 256
coredump_dir /home/cache
#refresh_pattern      .              0       20%     300 ignore-reload
```````````````````````````````````````````````````````````````````````

i check it over one day using debug message but found nothing, so i
recompile squid adding some debug message,
and found the cache has been store but the expires variable is set to -1 ...
so it lead to
clientProcessRequest2: !storeEntryValidToSend MISS

log like this:

first request ( no cache object )

2011/07/21 16:40:56.668| StoreEntry::InvokeHandlers: checking client #0
2011/07/21 16:40:56.668| storeClientCopy2: returning because
ENTRY_FWD_HDR_WAIT set
2011/07/21 16:40:56.668| ctx: enter level  0: 'xxxxxxxxx'
2011/07/21 16:40:56.668| haveParsedReplyHeaders: HTTP CODE: 404
2011/07/21 16:40:56.668| httpMaybeRemovePublic: HTTP CODE: 404
2011/07/21 16:40:56.668| storeGet: looking up 7422A1837529156D1D98B1B10AB87DE2
2011/07/21 16:40:56.668| storeGet: looking up 90A4D13F2204DBA06956DBCBB39C00E5
2011/07/21 16:40:56.668| negativeCache: expires:-1
2011/07/21 16:40:56.668| StoreEntry::hashInsert: Inserting Entry
0x9ff9cd8 key '7422A1837529156D1D98B1B10AB87DE2'
2011/07/21 16:40:56.668| ctx: exit level  0


second request ( found one cache but not valid... )

2011/07/21 16:40:58.162| ClientHttpRequest::httpStart: NONE for 'xxxxxxxxx'
2011/07/21 16:40:58.162| clientStreamRead: Calling 1 with cbdata
0x9ff4c7c from node 0x9ff21e0
2011/07/21 16:40:58.162| storeGet: looking up 7422A1837529156D1D98B1B10AB87DE2
2011/07/21 16:40:58.162| validToSend: ENTRY_NEGCACHED: expires:-1
squid_curtime:1311237658
2011/07/21 16:40:58.162| clientProcessRequest2: !storeEntryValidToSend MISS
2011/07/21 16:40:58.162| clientProcessMiss: 'GET xxxxxxxxx'

can someone help me to find out why the negative_ttl not work here ?
or i has some mistakes in the config file?

thanks a lot....

2011-07-21
ssmax


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