IBM Support

PM18453: SMALL RESPONSES (<32K) ARE NOT SENT TO CLIENT UNTIL REQUEST COMPLETES

Fixes are available

7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for AIX
7.0.0.15: Java SDK 1.6 SR9 Cumulative Fix for WebSphere Application Server
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for HP-UX
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for IBM i
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for Linux
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for Solaris
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for Windows
7.0.0.17: WebSphere Application Server V7.0 Fix Pack 17
7.0.0.17: Java SDK 1.6 SR9 FP1 Cumulative Fix for WebSphere Application Server
7.0.0.19: WebSphere Application Server V7.0 Fix Pack 19
7.0.0.21: WebSphere Application Server V7.0 Fix Pack 21
7.0.0.23: WebSphere Application Server V7.0 Fix Pack 23
7.0.0.25: WebSphere Application Server V7.0 Fix Pack 25
7.0.0.27: WebSphere Application Server V7.0 Fix Pack 27
7.0.0.29: WebSphere Application Server V7.0 Fix Pack 29
7.0.0.31: WebSphere Application Server V7.0 Fix Pack 31
7.0.0.27: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.33: WebSphere Application Server V7.0 Fix Pack 33
7.0.0.35: WebSphere Application Server V7.0 Fix Pack 35
7.0.0.37: WebSphere Application Server V7.0 Fix Pack 37
7.0.0.39: WebSphere Application Server V7.0 Fix Pack 39
7.0.0.41: WebSphere Application Server V7.0 Fix Pack 41
7.0.0.43: WebSphere Application Server V7.0 Fix Pack 43
7.0.0.45: WebSphere Application Server V7.0 Fix Pack 45
7.0.0.19: Java SDK 1.6 SR9 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.21: Java SDK 1.6 SR9 FP2 Cumulative Fix for WebSphere
7.0.0.23: Java SDK 1.6 SR10 FP1 Cumulative Fix for WebSphere
7.0.0.25: Java SDK 1.6 SR11 Cumulative Fix for WebSphere Application Server
7.0.0.27: Java SDK 1.6 SR12 Cumulative Fix for WebSphere Application Server
7.0.0.29: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.45: Java SDK 1.6 SR16 FP60 Cumulative Fix for WebSphere Application Server
7.0.0.31: Java SDK 1.6 SR15 Cumulative Fix for WebSphere Application Server
7.0.0.35: Java SDK 1.6 SR16 FP1 Cumulative Fix for WebSphere Application Server
7.0.0.37: Java SDK 1.6 SR16 FP3 Cumulative Fix for WebSphere Application Server
7.0.0.39: Java SDK 1.6 SR16 FP7 Cumulative Fix for WebSphere Application Server
7.0.0.41: Java SDK 1.6 SR16 FP20 Cumulative Fix for WebSphere Application Server
7.0.0.43: Java SDK 1.6 SR16 FP41 Cumulative Fix for WebSphere Application Server

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APAR status

  • Closed as program error.

Error description

  • Small responses (<32k) are not sent to client until request
    completes. This has potential to increase servlet execution
    times on fixpack 7.0.0.11.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All IBM WebSphere Application Server        *
    *                  Version 7 users.                            *
    ****************************************************************
    * PROBLEM DESCRIPTION: The response is not sent to the client  *
    *                      until any additional work is completed  *
    *                      after the return from a forward.        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    As a result of changes made by PM08760, a response to a request
    is not completed until after the resource which was the target
    of the request completes. This can appear as a delay in the
    response if the target resource forwards the request to another
    resource and then completes further processing on return from
    the forward. Prior to PM08760 the response was completed on the
    return from the forward, but after PM08760 the response is not
    completed until after the further processing of the target
    resource. PM08760 provided a custom property to revert to the
    original behavior but this opens the security issue which
    PM08760 fixed.
    

Problem conclusion

  • This APAR removes the WebContainer custom property introduced
    by PM08760.  and introduces the default following behavior:
    
    For a request which results in a forward request, on return
    from the forward request the response will be completed and
    any post data associated with the request will no longer be
    available for read.
    
    For a request which results in a redirect request, the
    redirect will be completed on return from the target resource
    and any post data associated with the request will be
    available for read after the sendRedirect method returns. This
    is PM08760 default behavior.
    
    The APAR further introduces 3 new WebContainer custom
    properties which are available to modify this default
    behavior. However, it is anticipated that the default behavior
    will be appropriate for most users.
    
    com.ibm.ws.webcontainer.SendResponseToClientWhenResponseIsComple
    te (true(default)/false) - If this property is set to false, a
    response will not be completed on return from a forward
    request but will be delayed until the target resource
    completes. Also post data will be available for read after the
    forward completes. This is PM08760 default behavior.
    
    com.ibm.ws.webcontainer.SendResponseToClientAsPartOfSendRedirect
    (true/false(default)) - If this property is set to true, a
    response will will be completed as part of a sendRedirect
    request and any post data associated with the request will not
    be available for read on return from sendRedirect.
    
    com.ibm.ws.webcontainer.KeepUnreadPostDataAfterResponseSentToCli
    ent (true/false(default)) - If this property is set to true
    post data will be available to read after the client response
    is completed either after a forward request completes (default
    behavior) or on return from sendRedirect
    (com.ibm.ws.webcontainer.SendResponseToClientAsPartOfSendRedirec
    t=true). However, note that this requires unread post data to
    be held in memory until the target resource completes and will
    increase memory usage.
    
    Note that the security issue fixed by PM08760 is also fixed
    for all combinations of the new custom properties.
    
    The fix for this APAR is currently targeted finclusion in
    fix pack 7.0.0.15.  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 number

    PM18453

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-07-14

  • Closed date

    2010-09-27

  • Last modified date

    2010-09-27

  • 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

    WEBS APP SERV N

  • Fixed component ID

    5724H8800

Applicable component levels

  • R700 PSY

       UP



Document information

More support for: WebSphere Application Server
General

Software version: 7.0

Reference #: PM18453

Modified date: 27 September 2010