- CORS Essentials
- Rajesh Gunasundaram Randall Goya
- 156字
- 2021-07-09 19:53:41
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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