There are new EXEC CICS WEB commands for CICS® as an HTTP client. Also, some commands have been modified for CICS as an HTTP client, but are unchanged for CICS as an HTTP server. The new and changed client commands are described in Changes to the application programming interface (HTTP client requests).
The EXEC CICS WEB SEND and EXEC CICS WEB RECEIVE commands are enhanced for HTTP/1.1 support when used by CICS as an HTTP server, and are described in Changes to the application programming interface (HTTP/1.1 support).