Changes to problem determination

New messages and trace points, and one new abend code, are introduced for the enhancements to CICS® Web support. Any information received by CICS as Warning headers in HTTP messages is collected and written to the TD queue CWBW.

Warning messages in HTTP headers

If the Warning header is present on an HTTP message, it normally contains information that is intended to be read by a user. If CICS Web support receives a message with a Warning header, the text associated with the header, and the IP address of the sender, is written to the transient data queue CWBW. (CWBW is indirected to CSSL.) If you receive too many warning headers, you can remove the CWBW transient data queue to suppress these records.

Messages

New DFHWBxxxx messages are introduced as a result of the enhancements to CICS Web support. All new and changed messages are described in the CICS Messages and Codes manual.

Abend codes

One new abend code is introduced, AWBP. It is used when a Web-aware application for CICS as an HTTP server is sending a chunked message, but fails to send the final empty chunk to complete the message.

Trace

New CICS trace points are added to the WB domain trace for the enhancements to CICS Web support. The new trace points are in the range WB 0419 to WB 0C07.

To control the output of CICS trace information, use CICS trace control in the normal way.