<?xml version="1.0"?>

<!--
  Copyright (C) Nginx, Inc.
  -->

<!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">

<module name="Module ngx_http_keyval_module"
        link="/en/docs/http/ngx_http_keyval_module.html"
        lang="en"
        rev="2">

<section id="summary">

<para>
The <literal>ngx_http_keyval_module</literal> module (1.13.3) creates variables
with values taken from key-value pairs managed by the
<link doc="ngx_http_api_module.xml" id="http_keyvals_">API</link>.
</para>

<para>
<note>
This module is available as part of our
<commercial_version>commercial subscription</commercial_version>.
</note>
</para>

</section>


<section id="example" name="Example Configuration">

<para>
<example>
http {

    keyval_zone zone=one:32k state=one.keyval;
    keyval $arg_text $text zone=one;
    ...
    server {
        ...
        location / {
            return 200 $text;
        }

        location /api {
            api write=on;
        }
    }
}
</example>
</para>

</section>


<section id="directives" name="Directives">

<directive name="keyval">
<syntax>
    <value>key</value>
    <value>$variable</value>
    <literal>zone</literal>=<value>name</value></syntax>
<default/>
<context>http</context>

<para>
Creates a new <value>$variable</value> whose value
is looked up by the <value>key</value> in the key-value database.
Strings are matched ignoring the case.
The database is stored in a shared memory zone
specified by the <literal>zone</literal> parameter.
</para>

</directive>


<directive name="keyval_zone">
<syntax>
    <literal>zone</literal>=<value>name</value>:<value>size</value>
    [<literal>state</literal>=<value>file</value>]</syntax>
<default/>
<context>http</context>

<para>
Sets the <value>name</value> and <value>size</value> of the shared memory zone
that keeps the key-value database.
Key-value pairs are managed by the
<link doc="ngx_http_api_module.xml" id="http_keyvals_">API</link>.
</para>

<para>
The optional <literal>state</literal> parameter specifies a <value>file</value>
that keeps the current state of the key-value database in the JSON format
and makes it persistent across nginx restarts.
</para>

</directive>

</section>

</module>