August 2011
Intermediate to advanced
546 pages
20h 53m
English
Content preview from Programming Social Applications
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How Is Origin Determined?
Browsers will compare two URLs to determine the origin based on a number of factors. These factors include the domain name, the application layer protocol, and in many browsers, the port used.
For example, say that we are making AJAX requests from a script on http://www.site.com/page1.html to access resources on other pages. Table A-1 outlines the results for several different URLs.
Table A-1. Results of making an AJAX request from a script on http://www.site.com/page1.html
URL requested | Outcome | Reason |
|---|---|---|
Success | Same host and protocol | |
Fail | Different port | |
Fail | Different protocol (https) | |
Fail | Different host (not an exact match) | |
Fail | Different host (subdomain) |
Understanding these rules when you’re working with client-side scripting languages like JavaScript will save you a lot of headaches when development begins.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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