November 2011
Intermediate to advanced
320 pages
10h 18m
English
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Same-Origin Policy for XMLHttpRequest
The XMLHttpRequest API, mentioned in this book on several prior occasions, gives JavaScript programs the ability to issue almost unconstrained HTTP requests to the server from which the host document originated, and read back response headers and the document body. The ability to do so would not be particularly significant were it not for the fact that the mechanism leverages the existing browser HTTP stack and its amenities, including ambient credentials, caching mechanisms, keep-alive sessions, and so on.
A simple and fairly self-explanatory use of a synchronous XMLHttpRequest could be as follows:
var x = new XMLHttpRequest(); x.open("POST", "/some_script.cgi", false); x.setRequestHeader("X-Random-Header", ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.