xslt_last_modified
The `xslt_last_modified` directive allows the server to respond with the last modified timestamp of an XML document processed with XSLT.
Description
The xslt_last_modified directive, when enabled, instructs NGINX to add a Last-Modified header to responses containing XML documents that have been processed through XSLT. This header indicates the last time the resource was modified, which can be useful for caching and optimization purposes. It is particularly relevant in scenarios where clients might cache such documents and benefit from knowing the recency of the content.
The directive can be set to either 'on' or 'off', and is applicable in various contexts such as http, server, and location. When enabled, it will take into consideration the last modification date of the underlying XML data being transformed rather than just the XSLT stylesheet itself. As a result, if the XML file has not changed since the last response, clients can effectively use caching mechanisms without needing to fetch the same data repeatedly.
Keep in mind that this directive should be used in conjunction with XSLT processing configurations to be effective. If no XSLT transformations are occurring, having this directive set to 'on' would have no tangible effect. This directive’s behavior is beneficial in optimizing performance and reducing unnecessary bandwidth usage by ensuring that clients can make informed caching decisions based on the recency of the resource being served.
Config Example
server {
listen 80;
location / {
xslt_last_modified on;
# additional configurations for XML and XSLT processing
}
}Ensure that XML files are updated properly; otherwise, clients may not receive updates due to caching.
If no XSLT processing is configured, this directive will have no effect.