how to do a hard refresh code example

Example 1: what is hard reload

Hard reload is not exposed directly in the UI of the browser. 
You activate the function with the keyboard shortcut 
Ctrl-Shift-R, Shift-F5, holding down Shift with reload button.
ignores the cache and will load all resources from the web page again

Example 2: chrome refresh cache

CTRL+F5 : to refresh the page by clearing GG chrome cache.