remoteip: force-cast and flatten arguments to arrays

templates/mod/remoteip.conf.erb

@@ -1,21 +1,23 @@
 # Declare the header field which should be parsed for useragent IP addresses
 RemoteIPHeader <%= @header %>
 
+<%- if @proxy_ips -%>
 # Declare client intranet IP addresses trusted to present
 # the RemoteIPHeader value
-<%- @proxy_ips.each do |proxy| -%>
+<%-   [@proxy_ips].flatten.each do |proxy| -%>
 RemoteIPInternalProxy <%= proxy %>
+<%-   end -%>
 <%- end -%>
 
-# Declare the header field which will record all intermediate IP addresses
 <%- if @proxies_header -%>
+# Declare the header field which will record all intermediate IP addresses
 RemoteIPProxiesHeader <%= @proxies_header %>
 <%- end -%>
 
+<%- if @trusted_proxy_ips -%>
 # Declare client intranet IP addresses trusted to present
 # the RemoteIPHeader value
-<%- if @trusted_proxy_ips -%>
-  <%- @trusted_proxy_ips.each do |proxy| -%>
+  <%- [@trusted_proxy_ips].flatten.each do |proxy| -%>
 RemoteIPTrustedProxy <%= proxy %>
   <%- end -%>
 <%- end -%>