PI78774: On Demand Router routes request to web module mapped with less specific virtual host match.

Fixes are available

APAR status

Closed as program error.

Error description

When there are multiple web modules that match a request
equally well (same context root, uri, and both either
generic
or non-generic applications), the web module is mapped to
the
less specific vhost and is sometimes selected when it is
preferable to select the web module with the most specific
vhost match. This routing mismatch causes the ODR to return
a
404 error code.

The preference for vhost matches from most specific to least
specific is as follows: exact match on both host and port,
host
match with wildcard port, wildcard host with port match,
wildcard host and wildcard port match.

Local fix

Ensure that there are no equivalent web module matches for
incoming requests

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server On Demand Router                     *
****************************************************************
* PROBLEM DESCRIPTION: An incoming request to the On Demand    *
*                      Router that matches multiple web        *
*                      modules with the same level of detail   *
*                      may be mapped to a web module with a    *
*                      less specific virtual host match.       *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
When a request arrives at the On Demand Router it is matched
with a web module using the virtual host as well as context
root, and uri mapping of the web module mapped to that virtual
host. A request will always be routed to the most specific web
module context root and uri mapping. However, if the context
root and uri mapping of multiple web modules are equal the
request should be routed to the web module mapped to the most
specific virtual host match. In the error case the web module
selected was the first virtual host match with the most specific
context root and uri mapping from the web module rather than the
most specific virtual host map.

Problem conclusion

The problem code was corrected to select the most specific
virtual host match when there are multiple equally good web
module matches using context root and uri pattern. The most
specific virtual host is selected using this criteria in
descending order: (1) exact match on host and port, (2) exact
match on host and wildcard on port, (3) wildcard on host and
exact match on port, and (4) wildcard on host and wildcard on
port

The fix for this APAR is currently targeted for inclusion in fix
pack 8.5.5.12.  Please refer to the Recommended Updates page for
delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Eliminate duplicate web module matches by providing more
specific context root and uri mappings such that requests will
match more specifically to only one web module.

Comments

APAR Information

APAR number
PI78774
Reported component name
WAS VIRTUAL ENT
Reported component ID
5725C9203
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-03-24
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 VIRTUAL ENT
Fixed component ID
5725C9203

Applicable component levels

R700 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSUP64","label":"WebSphere Virtual Enterprise"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
03 May 2022

Tips

PI78774: On Demand Router routes request to web module mapped with less specific virtual host match.

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

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