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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This specification defines the ESI Invalidation Protocol that allows for tight coherence between origin serves and surrogates also known as “Reverse Proxies”.

ETS for Linux version 5.

The goal of ESI is to solve the problem of web infrastructure scaling and content publishing. A debugging report on the ESI code of a source page and all included pages. Hesse Tom Killalea Jonathan F. February 20, Published in: Recent posts Ten New Data Centers: Alternatively the whole page with the ESI tags may be cached, and only the ESI requests may be made to the origin server.

Edge Side Includes

As a result, ESI enables companies to develop web applications once ajamai 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. The test origin server where the edge server sends requests instead of the origin server.


The document contains no ESI tags. For testing purposes, you can set up a test origin server to debug websites before deployment or modification. This specification defines ESI 1. My previous experience includes managing online marketing for travel agency, managing an online publishing platform and co-founding a tech startup.

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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 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. Reports ESI syntax errors.

Edge Side Includes – Wikipedia

Instead of being displayed to viewers, these ESI tags are directives that instruct an ESI processor to take some action. Please read our privacy policy for more information. Akamai will record this transcript. Reports all ESI-supported environment variables and their values.

Miller Paul Sagan Frederic V. These tokens appear as custom hostnames that look like this: The proposal editor was Mark Nottingham. It also includes an optional errors array that lists potentially more than one problem detected in the request. Edge Architecture Specification 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.


The W3C has acknowledged receipt, but has fsi accepted the proposal. Tom Leighton Rick M.

Shows the ESI source code. By providing a URL to your website or to your test server, you can generate a comprehensive debugging report. The purpose of ESI is to tackle the problem of web infrastructure scaling.

Scripting languages Proxy servers. Views Read Edit View history. Email Us Email Us??? Also, it provides features that let you emulate user geographical data and client-browser conditions.

ESI Debugger API v1 – Akamai Documentation | Akamai Developer

This allows different caching times for different parts of the page, or different degrees of personalisation. One simple example of an ESI element is the include tag which is used to include content external to the page.

There are four main features in ESI: Tom Leighton Pamela J. Reports information, esl, and error messages about ESI processing. Getting started To configure this API for the first time: You can receive information about any ESI syntax errors, evaluation messages to check whether the site is working properly, and all environment variables used for your test.