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

Fixes are available

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

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
24 October 2021

Tips

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

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

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

Fixed component ID

Applicable component levels

R700 PSY

Document Information

Share your feedback

Need support?