PI94539: MOD_PROXY_HTTP DOES NOT ALLOW HEADERS LARGER THAN 8K BYTES.

9.0.0.8: WebSphere Application Server traditional V9.0 Fix Pack 8
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
9.0.0.9: WebSphere Application Server traditional V9.0 Fix Pack 9
9.0.0.10: WebSphere Application Server traditional V9.0 Fix Pack 10
8.5.5.15: WebSphere Application Server V8.5.5 Fix Pack 15
9.0.0.11: WebSphere Application Server traditional V9.0 Fix Pack 11
9.0.5.0: WebSphere Application Server traditional Version 9.0.5 Refresh Pack
9.0.5.1: WebSphere Application Server traditional Version 9.0.5 Fix Pack 1
9.0.5.2: WebSphere Application Server traditional Version 9.0.5 Fix Pack 2
8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
9.0.5.3: WebSphere Application Server traditional Version 9.0.5 Fix Pack 3
9.0.5.4: WebSphere Application Server traditional Version 9.0.5 Fix Pack 4
9.0.5.5: WebSphere Application Server traditional Version 9.0.5 Fix Pack 5
WebSphere Application Server traditional 9.0.5.6
9.0.5.7: WebSphere Application Server traditional Version 9.0.5 Fix Pack 7
9.0.5.8: WebSphere Application Server traditional Version 9.0.5.8
8.5.5.20: WebSphere Application Server V8.5.5.20
8.5.5.18: WebSphere Application Server V8.5.5 Fix Pack 18
8.5.5.19: WebSphere Application Server V8.5.5 Fix Pack 19
9.0.5.9: WebSphere Application Server traditional Version 9.0.5.9
9.0.5.10: WebSphere Application Server traditional Version 9.0.5.10
8.5.5.16: WebSphere Application Server V8.5.5 Fix Pack 16
8.5.5.21: WebSphere Application Server V8.5.5.21
9.0.5.11: WebSphere Application Server traditional Version 9.0.5.11

APAR status

• Closed as program error.

Error description

• mod_proxy_http does not allow headers larger than 8K bytes. A
  directive should be added to allow the tuning of the proxy
  response buffer so headers larger than 8K bytes can be handled.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of IBM HTTP Server (powered by        *
  *                  Apache)                                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: mod_proxy_http truncates large headers  *
  *                      greater than 8K bytes.                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  mod_proxy_http will truncate large headers greater than 8K
  bytes.
  On z/OS, users may also see proxied requests fail due to large
  headers, because IHS will not translate the headers to EBCDIC
  causing IHS to think it is an invalid header.
  

Problem conclusion

• mod_proxy_http was modified to allow the header size for
  proxied
  responses to be configurable via the worker parameter
  ResponseFieldSize.
  
  This fix is targeted for IBM HTTP Server fix packs:
  - 8.5.5.14
  - 9.0.0.8
  

Temporary fix

Comments

APAR Information

• 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

  IBM HTTP SERVER

• Fixed component ID

  5724J0801

Applicable component levels

• R800 PSY

     UP

• R850 PSY

     UP

• R900 PSY

     UP