Edge Side Includes or ESI is a small markup language for edge level dynamic web content ESI is implemented by some content delivery networks, such as Akamai, and by some caching proxy servers such as Varnish, Squid and Mongrel . A dockerized version of Akamai’s Edge Side Includes Test Server (ETS). – akamai /esi-test-server-docker. ESI is currently supported by Content Delivery Networks: Akamai, Fastly, CloudFlare and caching proxy servers – Varnish, Squid and Mongrel.

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Increase speed, availability and reliability of your website by learning from the experts in our FREE email course. This creates a problem for caching systems. This allows different caching times for different parts of the page, or different degrees of personalisation.

Edge Side Includes (ESI) – A Complete Overview

This sample shows an incorrect input error, where the type value defines the type of problem, and the instance may be useful if you need to communicate about the problem with your Akamai support representative: Ei information, warning, and error messages about ESI processing.

A debugging report on the ESI code of a source page and all included pages. You can use it to debug aamai websites or test origin sites.

From Wikipedia, the free encyclopedia. This document defines the Edge Architecture, which extends the web infrastructure through the use of HTTP surrogates – intermediaries that act on behalf of an origin server.

How does it work? Please read our privacy akmai for more information. By using this site, you agree to the Terms of Use and Privacy Policy. Email Us Email Us??? Shows the ESI source code. The W3C has acknowledged receipt, but has not accepted the proposal. Akamai also adds additional features to the version they support. This specification defines ESI 1.


Instead of being displayed to viewers, these ESI tags are directives that instruct an ESI processor to take some action. Akamai will record this transcript. The ESI system is usually a caching proxy server so it may have a local copy of these files which it can insert without going back to the server. February 20, Published in: My previous experience includes managing online marketing for travel agency, managing an online publishing platform and co-founding a tech startup.

This page was last edited on 22 Septemberat GlobalDots helps companies to evaluate, purchase, and integrate cloud services by acting as a neutral consultancy layer between vendors and customers with a keen focus on optimizing performance, workflows, and costs. The proposal editor was Mark Nottingham. This allows different caching times for different parts of the page, or different degrees of personalization.

Edge Side Includes

Alternatively the whole page with the ESI tags may be cached, and only the ESI requests may be made to the origin server. For testing purposes, you can set up a test origin server to debug websites before deployment or modification. Reports ESI syntax errors. Tom Leighton Pamela J. ESI Language Specification 1.

Getting started To configure this API for the first time: To diagnose many common problems Akamai customers experience when delivering content to their end users, see also The Diagnostic Tools API. This specification defines the ESI Invalidation Protocol that allows for tight coherence between origin serves and surrogates also known as “Reverse Proxies”.

The goal of ESI is to solve the problem of web infrastructure scaling and content publishing. By assembling dynamic pages from individual page fragments only non- cacheable or expired fragments need to be fetched from the origin location, thereby lowering the need to retrieve complete pages. The XML based ESI tags indicate to the edge-side processing agent the action that needs to be taken to complete the page’s assembly.


It is fairly common for websites to have generated content. An ESI debugging report consists of the following subsections: There are four main features in ESI: The purpose of ESI is to tackle the problem of web infrastructure scaling.

By providing a URL to your website or to your test server, you can generate a comprehensive debugging report. As a result, ESI enables companies to develop web applications once and choose at deployment time where the web application should be assembled – on the content management system, the application server, or the content delivery network, thus reducing complexity, development time and deployment costs.

Also, it provides features that let you emulate user geographical data and client-browser conditions.

Edge Side Includes | Customer Support | Akamai

The document contains no ESI tags. The proposal editor was Mark Nottingham. Reports all ESI-supported environment variables and their values. ESI leverages client tools such as caches to improve end-user performance, reduce processing overhead on the origin server, and enhance availability.

ESI is implemented by some content delivery networkssuch as Akamai, and by some caching proxy servers such as VarnishSquid and Mongrel ESI, [2] although many do not implement the complete specification. One simple example of an ESI element is the include tag which is used to include content external to the page.

The test origin server where the edge server sends requests instead of the origin server. This operation provides a debugging report on the ESI code of your source page and all pages that the source page references. Member is required in requests, or always present in responses, even if its value is empty or null.

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