NAME Apache2::Layer - Layers for DocumentRoot VERSION version 1.103360 SYNOPSIS # in httpd.conf DocumentRoot "/usr/local/htdocs" # load module PerlLoadModule Apache2::Layer # enable layers for whole server EnableDocumentRootLayers On # disable location strip DocumentRootLayersStripLocation Off # paths are relative to DocumentRoot DocumentRootLayers layered/christmas layered/promotions <VirtualHost *:80> ... # layers enabled for this vhost </VirtualHost> <VirtualHost *:80> ... DocumentRoot "/usr/local/vhost2" # disabled by default EnableDocumentRootLayers Off <LocationMatch "\.png$"> # layer images only EnableDocumentRootLayers On DocumentRootLayers images_v3 images_v2 </LocationMatch> <Location "/images"> DocumentRootLayersStripLocation On </Location> <Location "/images/company1"> DocumentRootLayers company1/images default/images </Location> <Location "/images/company2"> DocumentRootLayers company2/images default/images </Location> </VirtualHost> <VirtualHost *:80> ... PerlOptions +MergeHandlers PerlTransHandler My::Other::Handler </VirtualHost> DESCRIPTION Create multiple layers to allow incremental content modifications. If file was found in layered directory it will be used instead of one from "DocumentRoot". Loaded module adds itself as "PerlTransHandler" and "PerlMapToStorageHandler", so please remember to use PerlOptions +MergeHandlers if you want to define your own handlers for those phases. DIRECTIVES Apache2::Layer needs to be loaded via "PerlLoadModule" due to use of following directives: EnableDocumentRootLayers Syntax: EnableDocumentRootLayers On|Off Default: EnableDocumentRootLayers Off Context: server config, virtual host, <Location* Enable use of "DocumentRootLayers". DocumentRootLayersStripLocation Syntax: DocumentRootLayersStripLocation On|Off Default: DocumentRootLayersStripLocation On Context: server config, virtual host, <Location* Remove the path specified in <Location>, <LocationMatch> from the URI before searching for layered file. That allows to simplify the file hieratchy tree, eg. <Location "/images"> DocumentRootLayersStripLocation On </Location> <Location "/images/company1"> DocumentRootLayers company1/images default/images </Location> <Location "/images/company2"> DocumentRootLayers company2/images default/images </Location> for following requests: /images/company1/headers/top.png /images/company2/headers/top.png those paths would be searched: company1/images/headers/top.png default/images/headers/top.png company2/images/headers/top.png default/images/headers/top.png but with "DocumentRootLayersStripLocation Off": company1/images/images/company1/headers/top.png default/images/images/company1/headers/top.png company2/images/images/company2/headers/top.png default/images/images/company2/headers/top.png DocumentRootLayers Syntax: DocumentRootLayers dir-path1 [dir-path2 ... dir-pathN] Context: server config, virtual host, <Location* Specify content layers to be used on top of "DocumentRoot". If the *dir-path** is not absolute it is assumed to be relative to "DocumentRoot". Directories are searched in order specified and first one containing the file is used. If file does not exists in any of them module falls back to "DocumentRoot". SEE ALSO Module was created as a result of upgrade existing application from mod_perl1 to mod_perl2 and is a replacement for Apache::Layer. AUTHOR Alex J. G. Burzyński <ajgb@cpan.org> COPYRIGHT AND LICENSE This software is copyright (c) 2010 by Alex J. G. Burzyński <ajgb@cpan.org>. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.