PM93326: CANNOT SET HEADER RESPONSE ALREADY COMMITTED WHEN USING EDGE SIDE INCLUDE (ESI) CACHING

8.5.5.1: WebSphere Application Server V8.5.5 Fix Pack 1
8.5.5.2: WebSphere Application Server V8.5.5 Fix Pack 2
8.5.5.3: WebSphere Application Server V8.5.5 Fix Pack 3
8.5.5.4: WebSphere Application Server V8.5.5 Fix Pack 4
8.5.5.5: WebSphere Application Server V8.5.5 Fix Pack 5
8.5.5.6: WebSphere Application Server V8.5.5 Fix Pack 6
8.5.5.7: WebSphere Application Server V8.5.5 Fix Pack 7
8.5.5.8: WebSphere Application Server V8.5.5 Fix Pack 8
8.5.5.9: WebSphere Application Server V8.5.5 Fix Pack 9
8.5.5.10: WebSphere Application Server V8.5.5 Fix Pack 10
8.5.5.11: WebSphere Application Server V8.5.5 Fix Pack 11
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.15: WebSphere Application Server V8.5.5 Fix Pack 15
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14

APAR status

• Closed as program error.

Error description

• Applications that use Edge Side Include (ESI) caching can
  experience the following exception
  
  [5/17/13 9:03:35:675 CDT] 0000002f SRTServletRes 3
  containsHeader name --> Surrogate-Control response --> false :
  com.ibm.ws.webcontainer.srt.SRTServletResponse@52ba52ba
  [5/17/13 9:03:35:675 CDT] 0000002f BinaryHeaderN 3
  Char value [Surrogate-Control] matches key: Key:
  Surrogate-Control Ordinal: 51
  [5/17/13 9:03:35:675 CDT] 0000002f SRTServletRes 3
  setInternalHeader name --> Surrogate-Control value --> no-store
  
  When the ESI cache is disabled the message is no longer seen.
  com.ibm.ws.webcontainer.srt.SRTServletResponse@52ba52ba
  [5/17/13 9:03:35:675 CDT] 0000002f SRTServletRes 3
  setHeader name --> Surrogate-Control value --> no-store
  checkInclude
  --> false :
  com.ibm.ws.webcontainer.srt.SRTServletResponse@52ba52ba
   [5/17/13 9:03:35:676 CDT] 0000002f SRTServletRes W   WARNING:
  Cannot
  set header. Response already committed
  

Local fix

• When the ESI Cache is disabled the messages are no longer seen
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server Liberty Profile using Edge Side      *
  *                  Include caching (ESI).                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: A warning occurs if a header is set     *
  *                      on an already committed response.       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Dynacache sets the Surrogate-Control header on the
  response object during ESI processing. If the response is
  already committed a warning is written to SystemOut.log.
  

Problem conclusion

• Dynacache will now set the header only if the response is not
  already committed.
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 8.5.5.1. Please refer to the Recommended Updates page
  for delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

Comments

APAR Information

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

  PM89992

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

Fix information

• Fixed component name

  LIBERTY PROFILE

• Fixed component ID

  5724J0814

Applicable component levels

• R850 PSY

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