The following instructions support:
Add the following, and update your configuration in MAMP Pro under:
Hosts > {your host} > Apache > Additional parameters for <VirtualHost> directive
<VirtualHost *:80>
ServerName dev.multisite
ServerAlias *.dev.multisite
<Location "/">
Redirect permanent "https://%{HTTP_HOST}%{REQUEST_URI}"
</Location>
</VirtualHost>
<VirtualHost *:443>
ServerName dev.multisite
ServerAlias *.dev.multisite
SSLEngine On
SSLCertificateFile /path/to/your/Applications/MAMP/Library/OpenSSL/certs/dev.multisite.crt
SSLCertificateKeyFile /path/to/your/Applications/MAMP/Library/OpenSSL/certs/dev.multisite.key
</VirtualHost>