Hi @shivama92274331,
X-Dispatcher is added explicitly using mod_headers.c module in vhost file in <VirtualHost.. entry or can be added at CDN level if you have one.
<IfModule mod_headers.c>
Header add X-Dispatcher <<dispatchername>>
</IfModule>
If this entry is available and still not available in response headers, share the webserver and dispatcher version details to debug further.