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Informations about the package silverstripe-server-timing

Introduction

This module allows developers to add Server-Timing information to headers for a SilverStripe application.

The Server Timing API allows you to pass request-specific timing data from the server to the browser via response headers.

This is an example of the Server Timing header information looks in development tools of Chrome:

Requirements

Installation

Configuration

It is recommended to add the \Internetrix\Control\Middleware\ServerTimingMiddleware::class to the top of the middleware execution pipeline. This will require the middleware to be added before the SilverStripe CMS has been fully bootstrapped.

To do so we can edit the SilverStripe CMS entry point file located either at public/index.php, or directly in your project root at index.php if your project doesn't use the public web root.

Find the line that instantiates HTTPApplication. Call the addMiddleware method on the HTTPApplication instance and pass it an instance of the ServerTimingMiddleware class. Remember to pass it an instance of ServerTiming:

By default the following metrics is added to the response headers:

Adding more timing metrics

A developer can also add more timing-metrics to the header by using start and end methods on the Internetrix\Helper\ServerTiming class. Please note that the name of the metric should be passed as the parameter and needs to be the same for start and stop.

The start and stop methods can be called from within different parts of the SilverStripe application.

Alternatively, we can also use the addMetric method on ServerTiming when we want to measure a metric from the start of the request. The duration for the metric will then be calculated using the start time of the request and the current time.

Client-Side Analytics Integration

Note: The interface may only available in secure contexts (HTTPS) in some browsers.

The default and custom timing metrics defined in the Server-Timing headers can be retrieved on the client-side for third-party Analytics integration (i.e Google Analytics) using the PerformanceObserver Web API using JavaScript.

Add the following script to the base Page.ss template file and/or any pages before the </body> tag you want the server-timing API information to be retrieved on the client-side. The script will push all server-timing metrics data to a global dataLayer JavaScript variable which can then be used for analytics.

This is an example of how the default Server-Timing metrics are stored within the global dataLayer variable:

Credits

This module was inspired and based on the following package for the Laravel framework:

https://github.com/beyondcode/laravel-server-timing.

It has been refactored to be compatible with the SilverStripe framework.

Licence

Please see License File for more information.

All versions of silverstripe-server-timing with dependencies

PHP Build Version
Package Version
Requires silverstripe/vendor-plugin Version ^1.0
silverstripe/framework Version ~4.0
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