+ This backend filter is a Z39.50 client. This modules
+ proxies all Z39.50 packages to a target. HTTP packages are ignored.
+ The address of the backend target (host) can be given as part of the
+ Initialize Request (Virtual host) or the default target may be specified
+ in the configuration.
+ </para>
+ <para>
+ <variablelist>
+ <varlistentry><term>timeout</term>
+ <listitem>
+ <para>
+ Specifies how long the client will wait for any request
+ before giving up. Default value is 30 seconds.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry><term>default_target</term>
+ <listitem>
+ <para>
+ Specifies the target (host) for the Z39.50 server to be used
+ if the Init Request does not indicate otherwise.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry><term>force_target</term>
+ <listitem>
+ <para>
+ Specifies the target (host) for the Z39.50 server to be used
+ always (regardless of Init Request vhost).
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>