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DSOs are add-on modules that extend the functionality of Apache.
These modules are self-contained code that can provide a wide-range
of additional Apache capabilities such as custom authentication
and authorization, custom logging, or creating new configuration
directives.
Users can create their own Apache modules or use those written by others. For
instance, the Apache Module Registry (http://modules.apache.org/)
is a web site with downloadable Apache modules. Some of these modules are
freely available while others have various license restrictions.
DSOs on MPE/iX can utilize Apache's full Application
Programming Interface (API) as well as Apache's full Extended
Application Programming Interface (EAPI).
A DSO is an Apache module with the same structure as the
modules compiled into the Apache binary. But instead of being statically
linked into the Apache program, the DSO module is created as a shared
library (NMXL). DSOs are loaded at Apache startup into Apache's
process space.
No recompilation of Apache is necessary to use DSOs. However,
DSOs require a DSO-enabled Apache. Apache for MPE/iX is enabled
for DSOs starting with Apache 1.3.9 (A.01.00).
Using DSO modules keeps Apache memory usage low by running
an Apache binary with core features only and adding additional features
with DSOs. DSOs also provide flexibility. An installation can pick
and choose which features to include in their web server.
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