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Map: the "volatile" parameter. By default, "map" creates cacheable variables [1]. With this parameter it creates a non-cacheable variable. An original idea was to deduce the cacheability of the "map" variable by checking the cacheability of variables specified in source and resulting values, but it turned to be too hard. For example, a cacheable variable can be overridden with the "set" directive or with the SSI "set" command. Also, keeping "map" variables cacheable by default is good for performance reasons. This required adding a new parameter. [1] Before db699978a33f (1.11.0), the cacheability of the "map" variable could vary depending on the cacheability of variables specified in resulting values (ticket #1090). This is believed to be a bug rather than a feature.
author Ruslan Ermilov <ru@nginx.com>
date Thu, 08 Dec 2016 17:51:49 +0300
parents b5ba6f22a0fc
children 1cd63ae46243
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<!DOCTYPE html>
<html>
<head>
<title>Error</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>An error occurred.</h1>
<p>Sorry, the page you are looking for is currently unavailable.<br/>
Please try again later.</p>
<p>If you are the system administrator of this resource then you should check
the <a href="http://nginx.org/r/error_log">error log</a> for details.</p>
<p><em>Faithfully yours, nginx.</em></p>
</body>
</html>