Walter Lee

apple:/export/home/iws6.1sp9/plugins/nsapi/examples> cat expire.c

#ifdef XP_WIN32
#define NSAPI_PUBLIC __declspec(dllexport)
#else /* !XP_WIN32 */
#define NSAPI_PUBLIC
#endif /* !XP_WIN32 */

#include "nsapi.h"

NSAPI_PUBLIC int expire(pblock *pb, Session *sn, Request *rq)
{
.......

b. you can also see I change the function name above from

kpn_set_cacheable

expire

because at first, I got an error earlier when I used this function name,

Service fn="kpn-set-cacheable" max-age="15724800"

because it should be underscore as below, instead of hypens above.

int kpn_set_cacheable(pblock *pb, Session *sn, Request *rq)

So, when I tried this earlier, I got this error ,
[10/Jul/2008:13:55:14] config (11680): for host 129.150.154.110 trying to 
GET /images/, func_exec reports: HTTP2122: cannot find function named kpn-set-cacheable 


So, I changed the function name to expire to avoid any such above.
3. then I change the Makefile, there,
You can see my Makefile at
http://blogs.sun.com/walter/resource/code/Makefile

4. then

apple:/export/home/iws6.1sp9/plugins/nsapi/examples> touch expire.c
apple:/export/home/iws6.1sp9/plugins/nsapi/examples> make
cc -DNET_SSL -DSOLARIS -D_REENTRANT -DMCC_HTTPD -DXP_UNIX -DSPAPI20 -I../../include -I../../include/base -I../../include/frame -I../../include/nspr -I/usr/include/mps -c expire.c
make prepare
ld -G expire.o -o expire.so

apple:/export/home/iws6.1sp9/plugins/nsapi/examples> ls -lrt

-rw-rw-rw- 1 root other 2862 Jul 10 14:43 expire.c
-rwxrwxrwx 1 root other 5748 Jul 10 14:43 expire.so
-rw-rw-rw- 1 root other 4536 Jul 10 14:43 expire.o

5. then add this into the end of magnus.conf,

Init fn="load-modules" shlib="/export/home/iws6.1sp9/plugins/nsapi/examples/expire.so"

funcs="expire"

(all in 1 line above)

6. added this into the end of obj.conf,

<Object ppath="/export/home/iws6.1sp9/docs/images/*">
Service fn="expire" max-age="86400"
Service method="(GET|HEAD)" type="~magnus-internal/" fn="send-file" nocache=""
</Object>

(note - 1 day = 24 hr * 60 min * 60 sec = 86400 )

7. then restart,

pple:/export/home/iws6.1sp9/https-pblock/config> ../stop; ../start

8. test 1: a file inside /images dir,

apple:/export/home/iws6.1sp9/https-pblock/config> telnet apple.asia 61903
Trying 129.158.175.16...
Connected to apple.asia.sun.com.
Escape character is '^]'.
GET /images/blank.gif HTTP/1.0

HTTP/1.1 200 OK
Server: Sun-ONE-Web-Server/6.1
Date: Thu, 10 Jul 2008 06:50:15 GMT *** access time
Content-length: 43
Content-type: image/gif
Cache-control: public
Expires: Fri, 11 Jul 2008 06:50:15 GMT *** +1 day , see this below !
Last-modified: Thu, 10 Jul 2008 04:27:34 GMT
Accept-ranges: bytes
Connection: close

GIF89a€ÿÿÿ!ù
,L;Connection closed by foreign host.

So, we added the needed access +1 day timestamp into the Expires header above,

Expires: Fri, 11 Jul 2008 06:50:15 GMT

logs:

129.158.175.16 - - [10/Jul/2008:14:50:15 +0800] "GET /images/blank.gif HTTP/1.0" 200 43

9. test2 : a file outside the /images dir,

apple:/export/home/iws6.1sp9/https-pblock/config> telnet apple.asia 61903
Trying 129.158.175.16...
Connected to apple.asia.sun.com.
Escape character is '^]'.
GET /blank.gif HTTP/1.0

HTTP/1.1 200 OK
Server: Sun-ONE-Web-Server/6.1
Date: Thu, 10 Jul 2008 06:55:36 GMT
Content-length: 43
Content-type: image/gif
Last-modified: Thu, 27 Mar 2008 00:22:13 GMT
Accept-ranges: bytes
Connection: close

GIF89a€ÿÿÿ!ù
,L;Connection closed by foreign host.

(no such Expires header added as in test 1)

However, this is custom coding and used at your own risk.

(Credits should go to henkfictorie who posted this source code at

http://forum.java.sun.com/thread.jspa?threadID=5019803&messageID=9052343#9052343 )