0001992: files "stuck" in proxy cache

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Category

Severity

Reproducibility

Date Submitted

Last Update

0001992

[Resin]

minor

sometimes

09-05-07 11:06

10-24-07 10:49

Reporter

david-peterson

View Status

public

Assigned To

ferg

Priority

normal

Resolution

fixed

Status

closed

Product Version

3.0.19

Summary

0001992: files "stuck" in proxy cache

Description

We have noticed that at random occurrences a file will get "stuck" in the cache and even though the file has been updated on disk, the server will continue to send the old version of the file back to the client. This behavior persists long after the <cache-mapping/> directives specify the file to be cached.

It also seems somehow tied to the value of the Host: header. If that header is spoofed to something other than the name of the server the new file will be returned.

Additional Information

Output using wget to show the HTTP headers. The first request gets the old file, the second the new. The only difference is the value of the Host: header. The same thing happens going to the public VIP (www.salesforce.com), but this example goes directly to the real server to show the load balancer isn't somehow causing the problem. The Last-Modified time of the second fetch is the actual modification time on-disk.

$ wget --header="Host: www.salesforce.com" -S -O /dev/null http://public-web2-2-sjl:8085/common/assets/css/images/hdr_sfdc.gif [^]
--10:44:24-- http://public-web2-2-sjl:8085/common/assets/css/images/hdr_sfdc.gif [^]
           => `/dev/null'
Resolving public-web2-2-sjl... 10.227.32.11
Connecting to public-web2-2-sjl|10.227.32.11|:8085... connected.
HTTP request sent, awaiting response...
  HTTP/1.0 200 OK
  Server:
  ETag: "GvG8oten0jA"
  Last-Modified: Thu, 15 Feb 2007 19:52:25 GMT
  Cache-Control: max-age=14400
  Expires: Wed, 05 Sep 2007 21:44:24 GMT
  Content-Type: image/gif
  Content-Length: 7069
  Date: Wed, 05 Sep 2007 17:44:24 GMT
Length: 7,069 (6.9K) [image/gif]

100%[===========================================================================================================================================================>] 7,069 --.--K/s

10:44:24 (4.94 MB/s) - `/dev/null' saved [7069/7069]

$ wget --header="Host: NOT-www.salesforce.com" -S -O /dev/null http://public-web2-2-sjl:8085/common/assets/css/images/hdr_sfdc.gif [^]
--10:44:29-- http://public-web2-2-sjl:8085/common/assets/css/images/hdr_sfdc.gif [^]
           => `/dev/null'
Resolving public-web2-2-sjl... 10.227.32.11
Connecting to public-web2-2-sjl|10.227.32.11|:8085... connected.
HTTP request sent, awaiting response...
  HTTP/1.0 200 OK
  Server:
  ETag: "C/S2FjXqlzG"
  Last-Modified: Wed, 05 Sep 2007 01:29:17 GMT
  Accept-Ranges: bytes
  Cache-Control: max-age=14400
  Expires: Wed, 05 Sep 2007 21:44:28 GMT
  Content-Type: image/gif
  Content-Length: 7903
  Date: Wed, 05 Sep 2007 17:44:28 GMT
Length: 7,903 (7.7K) [image/gif]

100%[===========================================================================================================================================================>] 7,903 --.--K/s

10:44:29 (5.41 MB/s) - `/dev/null' saved [7903/7903]

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

Here is the relevant configuration directives:

    <server>
        <cache path="${web.home}/logs/cache"/>

    <web-app-default>
        <cache-mapping url-pattern='*.gif' expires='4h'/>

Attached Files

Relationships

Notes
(0002268) david-peterson 09-05-07 11:09	Also, here are the corresponding lines from Resin's access log: 10.0.62.86 - - [05/Sep/2007:17:44:24 +0000] "GET /common/assets/css/images/hdr_sfdc.gif HTTP/1.0" 200 7069 "-" "Wget/1.10.2" 10.0.62.86 - - [05/Sep/2007:17:44:28 +0000] "GET /common/assets/css/images/hdr_sfdc.gif HTTP/1.0" 200 7903 "-" "Wget/1.10.2"

Issue History
Date Modified	Username	Field	Change
09-05-07 11:06	david-peterson	New Issue
09-05-07 11:09	david-peterson	Note Added: 0002268
10-24-07 10:49	ferg	Assigned To	=> ferg
10-24-07 10:49	ferg	Status	new => closed
10-24-07 10:49	ferg	Resolution	open => fixed
10-24-07 10:49	ferg	Fixed in Version	=> 3.0.25

Mantis 1.0.0rc3[^]

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