HTTPSERVERHDR

The HTTPSERVERHDR system initialization parameter specifies the value (up to 64 characters) that CICS® sets in the server header of HTTP responses.

HTTPSERVERHDR={YES|NO|'value'}
Valid values are as follows:
YES
The server header will be set to IBM_CICS_Transaction_Server/5.3.0(zOS) in outgoing HTTP responses.
NO
CICS will not add a server header to outgoing responses.
value
When you specify a value, the server header will include this value in outgoing HTTP responses.