PH43386: DFHWB0002 SEVERE ERROR (CODE X'071D') IN MODULE DFHWBCL. GETMAIN_ERROR

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The following message occurred.
  .
  DFHWB0002 .. A SEVERE ERROR (CODE X'071D') HAS OCCURRED IN
               MODULE DFHWBCL.
                                                                 .
  From the CICS internal trace, there was an exception entry like:
                                                                 .
  WB 071D WBCL  *EXC* - GETMAIN_ERROR FUNCTION(READ_RESPONSE)
    TRANSLATE(NO) TRUNCATE(YES) SESSION_TOKEN(34A24000 , 00000368)
    TIME_OUT_VALUE(FFFF)
    STATUS_TEXT(321EE7DA , 0000000F , 00000100)
                                                                 .
  The address in the SESSION_TOKEN was for the Web Client session,
  (WBO) block.
  From the WBO block, this showed the close header on response
  flag was on, the server was at http 1.1 or later, there was no
  content length existing and that the length of the response body
  was zeroes.
                                                                 .
  As there is no content-length header, DFHWBCL tries to receive
  the response body until the connection is closed, however there
  is also no response body.
  The first receive call returns a connection_closed response.
  This is correctly handled but DFHWBCL then attempts to allocate
  a zero length SET buffer.
  The getmain for this SET buffer fails and causes the severe
  error and dump to be issued.
  DFHWBCL should not attempt to continue with set buffer
  processing when the socket is closed and there is no response
  body to return to the caller.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: DFHWB0002 message with code(x'071D')    *
  *                      issued during EXEC CICS WEB RECEIVE SET *
  *                      command.                                *
  ****************************************************************
  * RECOMMENDATION: None                                         *
  ****************************************************************
  A CICS application uses EXEC CICS WEB SEND to send an HTTP
  request to a remote server.  An EXEC CICS WEB RECEIVE SET is
  issued to receive the response.  The server returns an HTTP
  error response of some kind and then immediately closes the
  connection.  DFHWBCL receives the HTTP headers and detects this
  is an HTTP/1.1 response that contains a Connection: close header
  but does not contain a Content-Length header.  This causes
  DFHWBCL to attempt to receive the response body data up until
  the connection is closed.  The connection was closed
  immediately without any body data being received.  DFHWBCL
  continues to allocate a SET buffer using the length of zero.
  DFHSMGF rejects the getmain with length of zero.  The getmain
  failure was unexpected and that causes DFHWBCL to issue a
  DFHWB0002 message with code(x'071D') and take a system dump.
  

Problem conclusion

• DFHWBCL has been changed to no longer allocate a SET buffer when
  there was no response body received.
  The WB 071D trace point has been corrected to format the correct
  SMGF parameter list in data-2 when tracing an unexpected
  getmain or freemain failure.
  

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:

  UI80028

Modules/Macros

• DFHWBAP  DFHWBAPF DFHWBBLI DFHWBCL  DFHWBSR  DFHWBSV
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R300 PSY UI80028

     UP22/04/22 P F204

Fix is available

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