Explanation/Reference:
Path-based site collections use Alternate Access Mappings. We must use Host-named site collections.
For Host-named site collections we must use Windows PowerShell commands to manage URLs (Set- SPSiteURL, Remove-SPSiteURL, Get-SPSiteURL).
To create a host-named site collection we use the Windows PowerShell New-SPSite cmdlet with the - HostHeaderWebApplication parameter.
Example: New-SPSite 'http://portal.contoso.com' -HostHeaderWebApplication 'http://<servername>' -Name
'Portal' -Description 'Customer root' -OwnerAlias 'contoso\administrator' -language 1033 -Template 'STS#0' Reference: Host-named site collection architecture and deployment (SharePoint 2013)
https://technet.microsoft.com/en-us/library/cc424952.aspx#section1b