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Learn ECMAScript

You're reading from   Learn ECMAScript Discover the latest ECMAScript features in order to write cleaner code and learn the fundamentals of JavaScript

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Product type Paperback
Published in Feb 2018
Publisher
ISBN-13 9781788620062
Length 298 pages
Edition 2nd Edition
Languages
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Authors (2):
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Narayan Prusty Narayan Prusty
Author Profile Icon Narayan Prusty
Narayan Prusty
MEHUL MOHAN MEHUL MOHAN
Author Profile Icon MEHUL MOHAN
MEHUL MOHAN
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Toc

Table of Contents (14) Chapters Close

Preface 1. Getting Started with ECMAScript FREE CHAPTER 2. Knowing Your Library 3. Using Iterators 4. Asynchronous Programming 5. Modular Programming 6. Implementing the Reflect API 7. Proxies 8. Classes 9. JavaScript on the Web 10. Storage APIs in JavaScript 11. Web and Service Workers 12. Shared Memory and Atomics 13. Other Books You May Enjoy

Same origin policy


Earlier, I said a couple of times that shared workers will be available only to those parent files which share the same origin. What does that mean?

Let us consider the URL http://www.packtpub.com/all.

Here's a table demonstrating which URLs will be of the same origin with this domain, and which won't be:

New URL

SameOrigin

Reason

http://www.packtpub.com/support

Yes

-

http://www.packtpub.com/account/abc/xyz

Yes

-

https://www.packtpub.com/all

No

Different protocol

http://username:[email protected]/all

Yes

-

http://www.packtpub.com:8000/somepage

No

Different port number

http://packtpub.com/somepage

No

Different host

http://dev.packtpub.com/somepage

No

Different host

 

By now, I believe that you will be able to guess what makes something the same origin and what does not. Yes, you're right! The same host, port, and protocol make two URLs under the same origin. For listed URLs which have their answers as yes, only those URLs will be able to access the shared worker spun by http://www.packtpub...

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