IT22481: CHUNKED ENCODING WITH HTTP COMPRESSION MIGHT CAUSE THE NEXT HTTP MESSAGE TO BE READ INCORRECTLY

Fix packs for DataPower Gateway version 7.1
Fix packs for DataPower Gateway version 7.2
Fix packs for DataPower Gateway version 7.5
Fix packs for DataPower Gateway version 7.5.1
Fix packs for DataPower Gateway version 7.5.2
Fix packs for DataPower Gateway version 7.6

APAR status

• Closed as program error.

Error description

• When chunked encoding and HTTP compression are enabled, some
  requests might fail with the following error:
  [0x80e00629][mpgw][error] mpgw (MPG_Tester):
  tid(1587703)[12.9.4.1] gtid(1587703): The header (0) is wrong
  when connecting to URL 'https://me.ibm.com/
  This occurs with persistent connections where packet
  fragmenting of a gzip+chunked HTTP message might leave stray
  bytes and corrupts the next message.
  

Local fix

• For requests to DataPower, disable HTTP compression in the HTTP
  Front Side Handler.
  For responses to DataPower, disable HTTP compression in the
  Main tab in the Multi-Protocol Gateway or Proxy Settings tab
  in the Web Service Proxy.
  

Problem summary

• Affected are all customers using HTTP (gzip) compression with
  chunked encoding on either side of their DataPower services.
  
  In some TCP packet fragmentation patterns, the reading side of
  such data stream can get satisfied sooner than the actual end of
  the chunk-encoded payload, which will then corrupt the TCP
  stream for the following transfer through the same persistent
  connection.
  

Problem conclusion

• Fix is available in 7.1.0.21, 7.2.0.18, 7.5.0.12, 7.5.1.11,
  7.5.2.11 and 7.6.0.4.
  
  For a list of the latest fix packs available, please see:
  http://www-01.ibm.com/support/docview.wss?uid=swg21237631
  

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

  DATAPOWER

• Fixed component ID

  DP1234567

Applicable component levels

• R710 PSN

     UP

• R720 PSN

     UP

• R750 PSN

     UP

• R751 PSN

     UP

• R752 PSN

     UP

• R760 PSN

     UP