PI80313: Enable Post Data to be read multiple times.

Fixes are available

APAR status

Closed as program error.

Error description

It is not possible to read post data both as parameters and
either using a InputStream or Reader. The second read will
not receive any data. This may occur, for example, when a
filter reads one or more parameters and a servlet tries to
read the post data as an InputStream, or vice-versa.

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server Liberty - Web Container              *
****************************************************************
* PROBLEM DESCRIPTION: Enable Post Data to be read multiple    *
*                      times.                                  *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
As part of request processing, post data may be read either as
parameters, using an InputStream, or using a Reader.  However
whichever method is used the WebContainer does a destructive
read of the data such that the data may be read only once for a
given request. So it is not possible to read post data both as
parameters and either using an InputStream or Reader. The second
read will not receive any data. This may occur, for example,
when a filter reads one or more parameters and a servlet tries
to read the post data as an InputStream, or vice-versa.

Problem conclusion

The WebContainer has been modified to enable multiple reads of
post data when the following WebContainer custom property is set
to true at the server level or the application level:

Add this in server.xml
<webContainer enablemultireadofpostdata="true" /> (default is
false)

or
   <context-param>
    <param-
name>com.ibm.ws.webcontainer.SET_MULTI_READ_WEBAPP</param-name>
<param-value>true</param-value>
  </context-param>

The context-param value will override the server level value of
the property.

With this property set the post data can be read multiple times
as either an InputStream, a Reader, or as parameters and in any
combination.

Further, to enable post data to be re-read from the beginning
using an InputStream, a Reader, or as Parameters, the following
sequence must be followed when using a Reader or InputStream:

1. Obtain the InputStream or Reader
2. Read data
3. Close the InputStream or Reader ( important step to make re-
read work)

Note that internally the WebContainer completes this sequence
when reading parameters.

If either steps 1 or 3 are not observed the next read of the
post data will not be reset to the beginning of the data.



The fix for this APAR is currently targeted for inclusion in fix
pack 17.0.0.2.  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
PI80313
Reported component name
WAS LIBERTY COR
Reported component ID
5725L2900
Reported release
CD0
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-04-20
Closed date
2017-05-11
Last modified date
2017-05-11

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
WAS LIBERTY COR
Fixed component ID
5725L2900

Applicable component levels

RCD0 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSD28V","label":"WebSphere Application Server Liberty Core"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"CD0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
03 May 2022

Tips

PI80313: Enable Post Data to be read multiple times.

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

RCD0 PSY

Document Information

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