1. open /etc/hosts

    It might look like

    ##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1       localhost
255.255.255.255 broadcasthost
::1             localhost
# Added by Docker Desktop
# To allow the same kube context to work on the host and the container:
127.0.0.1 kubernetes.docker.internal
# End of section

  2. If you want to map **testmysite.com** to your localhost, add a new line like

    127.0.0.1 testmysite.com

    ##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1       localhost
127.0.0.1       testmysite.com
255.255.255.255 broadcasthost
::1             localhost
# Added by Docker Desktop
# To allow the same kube context to work on the host and the container:
127.0.0.1 kubernetes.docker.internal
# End of section

  3. Start a server. If the server run on port 4000, go visit testmysite.com:4000, and you can see the site you create.