PK50460: MOD_DEFLATE WITH VARY HEADERS DOESN'T WORK.

PK53584; 2.0.47.1: IBM HTTP Server 2.0.47 Cumulative Interim Fix
PK65782; 2.0.47.1: IBM HTTP Server V2.0.47 Cumulative Interim Fix

APAR status

• Closed as program error.

Error description

• Responses with Vary headers are being overwritten instead of
  appended.  Changes implemented to correct this.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: IBM HTTP SERVER configurations which set     *
  * Vary response headers in applications or in the IHS          *
  * configuration and also use mod_deflate to compress those     *
  * responses                                                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: mod_deflate sets the Vary response      *
  * header to Accept-Encoding, instead of merging                *
  * Accept-Encoding into an existing Vary response header, so    *
  * the Vary information previously set is lost                  *
  ****************************************************************
  * RECOMMENDATION: Apply this fix if mod_deflate is enabled and *
  * a custom Vary response header is required.                   *
  ****************************************************************
  In some situations, an application response may require a Vary
  response header to indicate to a cache that the response can
  vary based on the value of a specified request header.  If for
  example the response can differ based on the Accept-Language
  request header field, then the application would include
  Accept-Language in the Vary response.
  mod_deflate needs to indicate that the exact response can
  vary based on whether or not Accept-Encoding was in the request,
  so it should add Accept-Encoding to the existing Vary.
  Unfortunately, it set Vary to Accept-Encoding instead of
  adding Accept-Encoding to the existing list, thus breaking
  applications which needed to set Vary.
  

Problem conclusion

• mod_deflate was updated to merge Accept-Encoding into any
  existing Vary response header.  If there is no Vary response
  header, one will be added which is set simply to
  Accept-Encoding.
  This fix is targeted for:
  Fix pack 6.1.0.13.
  Fix pack 6.0.2.23.
  Cumulative e-fix PK53584 for 2.0.47.1
  

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

  IBM HTTP SERVER

• Fixed component ID

  5724J0801

Applicable component levels

• R60A PSN

     UP

• R60H PSN

     UP

• R60P PSN

     UP

• R60I PSN

     UP

• R60S PSN

     UP

• R60W PSN

     UP

• R60Z PSN

     UP

• R61A PSN

     UP

• R61H PSN

     UP

• R61P PSN

     UP

• R61I PSN

     UP

• R61S PSN

     UP

• R61W PSN

     UP

• R61Z PSN

     UP