PK74501: PERFORMANCE - SET UPDATED "EXPIRES" HEADER ON A 304 RESOURCE RESPONSE.

6.1.0.2 Download: WebSphere Portal and Web Content Management V6.1, fix pack 2
6.1.0.3 Download: WebSphere Portal and WCM V6.1 fix pack 3, 6.1.5 feature pack
6.1.0.4 Download: WebSphere Portal and WCM V6.1.0 fix pack 4 & 6.1.5 fix pack 1
6.1.0.5 Download: WebSphere Portal and WCM V6.1.0 fix pack 5
6.1.0.6 Download: WebSphere Portal and WCM V6.1.0 fix pack 6

APAR status

• Closed as program error.

Error description

• If a conditional request is made for resources and WCM is
  returning a 304 indicating that no change had occurred to the
  requested resource then we should also be sending back the
  "Expires" header to prevent the browser making the same request
  again when the page next reloads.
  

Local fix

• E.g. If a spacer gif is used on all pages of a website then each
  page load will request this image. Having the
  resourceserver.browserCacheMaxAge set prevents browsers for
  re-requesting an image for the set amount of time. Once this
  time has been exceeded the browser will make a request to the
  server each time the image is encountered to check if it has
  changed. By sending back a new "Expires" value the browser will
  stop sending requests to the server.
  

Problem summary

• If a conditional request is made for resources and WCM is
  returning a 304 indicating that no change had occurred to the
  requested resource then we should also be sending back the
  "Expires" header to prevent the browser making the same request
  again when the page next reloads.
  

Problem conclusion

• E.g. If a spacer gif is used on all pages of a website then each
  page load will request this image. Having the
  resourceserver.browserCacheMaxAge set prevents browsers for
  re-requesting an image for the set amount of time. Once this
  time has been exceeded the browser will make a request to the
  server each time the image is encountered to check if it has
  changed. By sending back a new "Expires" value the browser will
  stop sending requests to the server.
  
  A fix for this problem is available for WCM 6.0.1.3 from Fix
  Central at:
  
  http://www.ibm.com/eserver/support/fixes/fixcentral/swgquickorde
  r?brandid=2&productid=Workplace%20Web%20Content%20Management&fix
  es=6.0.1.3-WCM-PK74501
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  LOTUS WEB CONT

• Fixed component ID

  5724I2900

Applicable component levels

• R60G PSY

     UP