PM03121: MOD_DEFLATE DOESN'T COMPRESS INTERNALLY REDIRECTED URLS

6.1.0.31: Java SDK 1.5 SR11 FP1 Cumulative Fix for WebSphere Application Server
6.1.0.33: Java SDK 1.5 SR12 FP1 Cumulative Fix for WebSphere
6.1.0.35: Java SDK 1.5 SR12 FP2 Cumulative Fix for WebSphere
6.1.0.37: Java SDK 1.5 SR12 FP3 Cumulative Fix for WebSphere
6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
6.1.0.39: Java SDK 1.5 SR12 FP4 Cumulative Fix for WebSphere Application Server
6.1.0.41: Java SDK 1.5 SR12 FP5 Cumulative Fix for WebSphere Application Server
6.1.0.43: Java SDK 1.5 SR13 Cumulative Fix for WebSphere Application Server
6.1.0.45: Java SDK 1.5 SR14 Cumulative Fix for WebSphere Application Server
6.1.0.47: Java SDK 1.5 SR16 Cumulative Fix for WebSphere Application Server

APAR status

• Closed as program error.

Error description

• The request has the following header:
  Accept-Encoding: gzip, deflate
  But the response data was not compressed.
  The request was internally redirected in IBM HTTP Server. For
  example, a "GET /" request was internally redirected to 'GET
  /cell/". Then the redirected request was handled by WebSphere
  Application Server. The response text/html data was not
  compressed.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  IBM HTTP Server ssers with mod_deflate      *
  *                  loaded that also use features such as       *
  *                  RewriteRule or ErrorDocument along with     *
  *                  URLs desired to be compressed.              *
  ****************************************************************
  * PROBLEM DESCRIPTION: mod_deflate takes no action on          *
  *                      responses that are the result of        *
  *                      Apache internal redirects.              *
  ****************************************************************
  * RECOMMENDATION:  Apply this fix if your configuration        *
  *                  performs internal redirects on requests     *
  *                  that will result in large, compressable     *
  *                  responses.                                  *
  ****************************************************************
  mod_deflate confused two internal Apache constructs,
  sub-requests and internal redirects, by way of using a library
  function call.   This incorrectly short-circuited processing
  of internal redirects.
  
  Internal redirects occur as a result of RewriteRule in
  per-directory context, RewriteRule with the "PT" flag, and
  the local-path form of ErrorDocument handling.
  

Problem conclusion

• mod_deflate was updated to check only that the request is not a
  subrequest, allowing internal redirects to be compressed.
  

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 PSY

     UP

• R60H PSY

     UP

• R60I PSY

     UP

• R60P PSY

     UP

• R60S PSY

     UP

• R60W PSY

     UP

• R60Z PSY

     UP

• R61A PSY

     UP

• R61H PSY

     UP

• R61I PSY

     UP

• R61P PSY

     UP

• R61S PSY

     UP

• R61W PSY

     UP

• R61Z PSY

     UP