+ 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>
+ <varlistentry><term>force_close</term>
+ <listitem>
+ <para>
+ Is a boolean value (false, true). If true, the Z39.50 client will
+ terminate Z39.50 sessions with a close APDU followed by a socket close.
+ If false (default), the Z39.50 client will be transparent and only
+ send a close if the peer client does it too.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry><term>client_ip</term>
+ <listitem>
+ <para>
+ Is a boolean value (false, true). If true, the Z39.50 client will
+ as part of the Init Request include Client-IP information (the
+ Z39.50 equivalent of HTTP X-Forwarded-To information). By default
+ this is false (not included).
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry><term>charset</term>
+ <listitem>
+ <para>
+ If set, holds Z39.50 negotiation charset (encoding) that is
+ sent via the Initialize Request. If Initalize Request already
+ contains negotaition information it will be left un-modified.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry><term>bind_host</term>
+ <listitem>
+ <para>
+ Is a boolean value (false, true). If true, the out going
+ TCP connection will be bound to the same as listening IP.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>