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CORS Essentials

CORS Essentials

By : Gunasundaram
3 (1)
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CORS Essentials

CORS Essentials

3 (1)
By: Gunasundaram

Overview of this book

This book explains how to use CORS, including specific implementations for platforms such as Drupal, WordPress, IIS Server, ASP.NET, JBoss, Windows Azure, and Salesforce, as well as how to use CORS in the Cloud on Amazon AWS, YouTube, Mulesoft, and others. It examines limitations, security risks, and alternatives to CORS. It explores the W3C Specification and major developer documentation sources about CORS. It attempts to predict what kinds of extension to the CORS specification, or completely new techniques, will come in the future to address the limitations of CORS Web developers will learn how to share code and assets across domains with CORS. They will learn a variety of techniques that are rather similar in their method and syntax. The book is organized by similar types of framework and application, so it can be used as a reference. Developers will learn about special cases, such as when a proxy is necessary. And they will learn about some alternative techniques that achieve similar goals, and when they may be preferable to using CORS
Table of Contents (10 chapters)
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9
Index

Permissions required by JavaScript

Let's consider content scraping. You can write a content scraping script that reads the rendered DOM of an external URI and creates local DOM elements with the same content, without any special configurations.

But what if you first need to run a script on the external URI, for example, to find out whether the user is the same as on your local site? You cannot trigger that external script and return the results without cross-origin sharing via CORS or a similar method to get around the same-origin policy.

JavaScript data storage access is strictly limited by origin

JavaScript data stored in the browser as Local Storage, or in IndexedDB, is separated by origin. Each origin has distinct storage, and JavaScript in one origin cannot read from or written to storage belonging to another origin unless it is given explicit access to a script on another domain by CORS or a similar method.

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