Hello Yi-Hsiang Cheng,
 I assume you are asking if the CSM can look at that header and do something specific?  The CSM actually only looks at the request headers from the client, it doesn't look at the response headers from the server.  Hence, it doesn't care what is in the packet, even if you are doing cookie insert.
These are the supported default client request headers: 
  Accept             standard header name
  Accept-Charset     standard header name
  Accept-Encoding    standard header name
  Accept-Language    standard header name
  Authorization      standard header name
  Cache-Control      standard header name
  Connection         standard header name
  Content-MD5        standard header name
  Expect             standard header name
  From               standard header name
  Host               standard header name
  If-Match           standard header name
  Pragma             standard header name
  Referer            standard header name
  Transfer-Encoding  standard header name
  User-Agent         standard header name
  Via                standard header name   
As well, you can specify your custom client header for inspection as well.
Regards,
Chris Higgins