Some gif images are not being sent with browser caching headers

T 10.1.12.123:3466 -> 10.0.1.25:8180 [AP]
GET /jira/images/icons/print.gif HTTP/1.1.
Host: serenity.lindenlab.com:8180.
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10.
Accept: image/png,image/*;q=0.8,*/*;q=0.5.
Accept-Language: en-us,en;q=0.5.
Accept-Encoding: gzip,deflate.
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7.
Keep-Alive: 300.
Connection: keep-alive.
Referer: http://serenity.lindenlab.com:8180/jira/secure/Dashboard.jspa.
Cookie: [removed]
.


T 10.0.1.25:8180 -> 10.1.12.123:3466 [AP]
HTTP/1.1 200 OK.
Server: Apache-Coyote/1.1.
ETag: W/"375-1235019814000".
Last-Modified: Thu, 19 Feb 2009 05:03:34 GMT.
Content-Type: image/gif;charset=UTF-8.
Content-Length: 375.
Date: Fri, 22 May 2009 14:12:48 GMT.
.
GIF89a.....0.......jjj.........{.....:W.i.....<X....w.......................................................................x..y...........;>@..C...TTT...""".@p...........................
..................!.....0.,...........@...*...$Q.l......"l..W.*.p.`....P
..X)u....Z..H5..I..B00.../*.../...../......!M..#............."..&.(+.....%..../).../...1../,.../..10./.M/.C1...0A.;

T 10.1.12.123:3468 -> 10.0.1.25:8180 [AP]
GET /jira/images/icons/help_blue.gif HTTP/1.1.
Host: serenity.lindenlab.com:8180.
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10.
Accept: image/png,image/*;q=0.8,*/*;q=0.5.
Accept-Language: en-us,en;q=0.5.
Accept-Encoding: gzip,deflate.
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7.
Keep-Alive: 300.
Connection: keep-alive.
Referer: http://serenity.lindenlab.com:8180/jira/secure/Dashboard.jspa.
Cookie: [removed]
.


T 10.0.1.25:8180 -> 10.1.12.123:3468 [AP]
HTTP/1.1 200 OK.
Server: Apache-Coyote/1.1.
ETag: W/"621-1235019814000".
Last-Modified: Thu, 19 Feb 2009 05:03:34 GMT.
Content-Type: image/gif;charset=UTF-8.
Content-Length: 621.
Date: Fri, 22 May 2009 14:12:48 GMT.
.
GIF89a.....e.,%
..\21.+#...31/...g.(...c0..1/...s..S..:..;20..*./+.21...{..Z..R..\..F..L..]0,.20...Z..D..q,$.-'...A20...:..M21...w0,...q..H.*...`..#.p ..-..o..~..b0....F..>..r32...flY(..)..1..zzuH.y&..S.
....L..b..a..h..,..N..v..F..H.....4..5..... ..+..W.l.gN... .m...V..1..^+"......;..N.....x..]..i..B..L..B..I..X33..@p.......................................................................
.......!.....e.,............e..d....ed<4.)).4<d.6.5&....&5.6..#/;.%..%.;/#.e..7.0."++".0.7...:.(...[.

.(.:.2....F\T..`....2.9>.1^Z''GC1.>9..=.$.cVAB]O.$.=..@`qa.."*T.A2........."..'_B4iq ...S.4...
.....P.....).}...C.D.....(......;

T 10.1.12.123:3461 -> 10.0.1.25:8180 [AP]
GET /jira/images/icons/bug.gif HTTP/1.1.
Host: serenity.lindenlab.com:8180.
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10.
Accept: image/png,image/*;q=0.8,*/*;q=0.5.
Accept-Language: en-us,en;q=0.5.
Accept-Encoding: gzip,deflate.
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7.
Keep-Alive: 300.
Connection: keep-alive.
Referer: http://serenity.lindenlab.com:8180/jira/secure/Dashboard.jspa.
Cookie: [removed]
.


T 10.0.1.25:8180 -> 10.1.12.123:3461 [AP]
HTTP/1.1 200 OK.
Server: Apache-Coyote/1.1.
ETag: W/"348-1235019814000".
Last-Modified: Thu, 19 Feb 2009 05:03:34 GMT.
Content-Type: image/gif;charset=UTF-8.
Content-Length: 348.
Date: Fri, 22 May 2009 14:12:48 GMT.
.
GIF89a........................................333..........::.kk................MM...................TT.............XX.....................................................................
..................!.......,..........y@A`H,..Hd..l6.....\h.Bju.Uj...!:eR$.L.. 7)....f.....!. .
w..{....
.w..........w.......w.!r...n..u.....d.....db.... dF.C.A.;

T 10.1.12.123:3463 -> 10.0.1.25:8180 [AP]
GET /jira/images/icons/priority_blocker.gif HTTP/1.1.
Host: serenity.lindenlab.com:8180.
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10.
Accept: image/png,image/*;q=0.8,*/*;q=0.5.
Accept-Language: en-us,en;q=0.5.
Accept-Encoding: gzip,deflate.
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7.
Keep-Alive: 300.
Connection: keep-alive.
Referer: http://serenity.lindenlab.com:8180/jira/secure/Dashboard.jspa.
Cookie:[removed]
.


T 10.0.1.25:8180 -> 10.1.12.123:3463 [AP]
HTTP/1.1 200 OK.
Server: Apache-Coyote/1.1.
ETag: W/"221-1235019814000".
Last-Modified: Thu, 19 Feb 2009 05:03:34 GMT.
Content-Type: image/gif;charset=UTF-8.
Content-Length: 221.
Date: Fri, 22 May 2009 14:12:48 GMT.
.
GIF89a...........##....{{.DD....ee.OO.99..........22.pp.......ZZ.............................................!.......,..........Z.$.di.hj....I4.k..Cc....:..'..P.!....b3...h.d..a..4.:.7.hb
.[*......G..F..%@....{j}.y)(+.&!.;

T 10.1.12.123:3464 -> 10.0.1.25:8180 [AP]
GET /jira/images/icons/task.gif HTTP/1.1.
Host: serenity.lindenlab.com:8180.
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10.
Accept: image/png,image/*;q=0.8,*/*;q=0.5.
Accept-Language: en-us,en;q=0.5.
Accept-Encoding: gzip,deflate.
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7.
Keep-Alive: 300.
Connection: keep-alive.
Referer: http://serenity.lindenlab.com:8180/jira/secure/Dashboard.jspa.
Cookie: [removed]
.


T 10.0.1.25:8180 -> 10.1.12.123:3464 [AP]
HTTP/1.1 200 OK.
Server: Apache-Coyote/1.1.
ETag: W/"231-1235019814000".
Last-Modified: Thu, 19 Feb 2009 05:03:34 GMT.
Content-Type: image/gif;charset=UTF-8.
Content-Length: 231.
Date: Fri, 22 May 2009 14:12:48 GMT.
.
GIF89a.......................................................333...fff.......................................!.......,..........d.C.dI=(JMl.Bg....."]C....D!6........D.P....8)O....:#..d..f
..I@`Fk..3T| 0.H$.A....
ku..DBS.p{..D&.#.!.;