Maintenance mode .htaccess rules

.htaccess

### Maintenance mode force redirect rules
# Note: based on source code from elsewhere, but I've lost the source.
# Let me know if you recognise any of this and want attribution!

# We don't need to tell everyone we're apache:
ServerSignature Off

# Set server admin email
ServerSignature EMail
SetEnv SERVER_ADMIN you@example.com

# ----------------------------------------------------------------------
# Apache: Turn on rewrite engine if available
# ----------------------------------------------------------------------

RewriteEngine On
RewriteBase /
Options All -Indexes
Options +FollowSymLinks

# ----------------------------------------------------------------------
# Maintenance Mode: remove when ready to set site live!
# ----------------------------------------------------------------------
<IfModule mod_rewrite.c>
    ### Either:
    # Add all the IP addresses of people that are helping in development
    # and need to be able to get past the maintenance mode.
    # One might call this the 'allow people list':
    # RewriteCond %{REMOTE_HOST} !^127\.0\.0\.1

    ### Or:
    # Use a custom UA string to circumvent maintenance mode:
    RewriteCond %{HTTP_USER_AGENT}  !^your-custom-user-agent$
    # Hint: use Chrome User Agent Switcher to create a custom UA:
    # @link https://chrome.google.com/webstore/detail/user-agent-switcher/kchfmpdcejfkipopnolndinkeoipnoia

    # Make sure maintenance mode only applies to this domain
    # Example: I am hosting different sites or subdomains on the same
    # server which could be affected by these rules:
    # RewriteCond %{HTTP_HOST} ^example.com$ [OR]
    # RewriteCond %{HTTP_HOST} ^www.example.com$


    # This is the 'ignore file list'. It allows access to all
    # files that are needed to display the maintenance mode page.
    # Example: pages, css files, js files, images, anything.
    # IMPORTANT: If you don't do this properly, visitors will end up with
    # endless redirect loops in their browser:
    RewriteCond %{REQUEST_URI} !/app/maintenance\.html$
    #RewriteCond %{REQUEST_URI} !/somejavascriptfile\.js$
    #RewriteCond %{REQUEST_URI} !/css\/yourstylesheet\.css$
    #RewriteCond %{REQUEST_URI} !/img\/yourlogo\.jpg$

    # Rewrite whatever request is coming in to the maintenance mode page
    # The R=302 tells browsers (and search engines) that this
    # redirect is only temporarily.
    # L stops any other rules below this from executing whenever somebody is redirected.
    RewriteRule \.*$ /app/maintenance\.html [R=302,L]
</IfModule>