PH59612: DFHPI0002 EXCEPTION HTTP HEADER_TOO_LONG

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The following message occurred:
  DFHPI0002 xxxxxxxx A severe error (code X'0507') has occurred in
  module DFHPITH.
                                                                 .
  CICS internal trace indicated an exception 'HEADER_TOO_LONG'.
  The container to hold the header is x'1000' bytes and the header
  was longer than this and got truncated.
                                                                 .
  xxxxx QR    AP 4820 CV64  ENTRY CONVERT_DATA..
  xxxxx QR    AP 4821 CV64  EXIT  CONVERT_DATA/EXCEPTION
                                  TARGET_BUFFER_EXHAUSTED,..
  xxxxx QR    PG 1901 PGCR  EXIT  GET_CONTAINER_INTO/EXCEPTION
                                  MORE_DATA,..
                                                                 .
  xxxxx QR    WB 0701 WBCL  EXIT  READ_RESPONSE/EXCEPTION
                                  HEADER_TOO_LONG..
  xxxxx QR    PI 0507 PITH  *EXC* WB_CLIENT_SUPPORT_FAILURE
                                                                 .
  Additional keywords: http request header limit 4k, x'1000'.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: HTTP response with header length larger *
  *                      than 4k returns HEADER_TOO_LONG         *
  *                      exception.                              *
  ****************************************************************
  The limit of 4K was enforced to avoid any rogue 4K HTTP header
  response to consume lots of storage. If a HTTP response with
  header length larger than 4k was to be received then EIBRESP=16
  and EIBRESP2=157 was returned indicating an exception
  HEADER_TOO_LONG.
  However, it may cause the truncation of header response and
  further processing may produce message DFHPI0002 xxxxxxxx A
  severe error (code X'0507') in module DFHPITH.
  

Problem conclusion

• The HTTP response length has been increased from 4K to 16K. Now,
  if more than 16k of headers is received then it fails with the
  existing EIBRESP=16 and EIBRESP2=157.
  
  Document for EXEC CICS WEB RECEIVE (Client) and EXEC CICS WEB
  CONVERSE will be changed to indicate 16k limit.
  
  The new description for RESP16, RESP2 157 will be
  
  The HTTP headers in the response are longer than 16k, and CICS
  is unable to process this HTTP response. The session is
  unusable, and a WEB CLOSE command is required.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PH59083

• APAR is sysrouted TO one or more of the following:

  UI99501 UI99502

Modules/Macros

• DFHWBCL
  

Fix information

• Fixed component name

  CICS TS Z/OS V6

• Fixed component ID

  5655YA100

Applicable component levels

• R400 PSY UI99502

     UP25/01/02 P F412

• R500 PSY UI99501

     UP25/01/02 P F412

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.