Apache login protection for specific host

gistfile1.txt

### If the server is accessed throught the dev URL example.dev
### User will need to authenticate.
SetEnvIf Host ^example\.dev$ require_auth=true

AuthUserFile /Path/To/.htpasswd
AuthName "Password Protected"
AuthType Basic

# Setup a deny/allow
Order Deny,Allow
# Deny from everyone
Deny from all
# except if either of these are satisfied
Satisfy any
# 1. a valid authenticated user
Require valid-user
# or 2. the "require_auth" var is NOT set
Allow from env=!require_auth


### Useful links
#### http://stackoverflow.com/questions/4068975/domain-name-specific-code-blocks-in-htaccess
#### http://stackoverflow.com/questions/14603568/password-protect-a-specific-url

This was very helpful for me, thank you