Why is Chrome calling the autocompleted url before validation?
This is Google's prefetch feature, which loads the page quicker, assuming you execute the auto-completed URL.
You can disable this option in Google Chrome:
Settings > Advanced Settings > Privacy: (uncheck) Prefetch resources..
Update 2019
I came across a similar question on superuser, which I provided an updated answer for.
- Disable page load prediction service
chrome://settings/ -> expand Advanced section
- Disable NoState Prefetch
chrome://flags -> search for "nostate"
