Bypassing restrictions on AJAX requests across different domains

Can the AJAX cross domain request limitation be bypassed by loading a JS file containing $.getJSON from the same server (domain) as the URL in the AJAX request? For example, if there is a webservice on serverA.com that needs to be accessed from pages on various domains like subdomain.serverA.com and serverB.com. The JS is hosted on serverA.com and included on different domains using an absolute URL:

<script src="http://serverA.com/ajax.js" />

And let's say the page URL is http://serverB.com/page.html

In this scenario, will 

$.getJSON('http://serverA.com/service/',...
be able to bypass cross domain limitations?

In simpler terms, do browsers consider the page URL or the source URL of the JS when enforcing the same-origin policy for AJAX requests?

javascriptajaxcross-domain

Answer №1

Are you wondering how to bypass the cross domain restrictions of JavaScript?

Yes, it can be done using JSONP.

Check out some helpful information below:

  • Basic example of using .ajax() with JSONP?
  • Ways to circumvent the same-origin policy
  • jQuery - How to remove cross domain limitation

If this doesn't answer your question, please provide more clarity on what you're looking for.

Answer №2

When it comes to evaluating the same-origin policy for AJAX requests, do browsers consider the page URL or the JS source URL?

The same origin policy is actually based on the URL of the HTML document that the script is executing on, rather than the URL of the script itself.

If a JS file with $.getJSON is loaded from the same server (domain) as the AJAX request URL, is it possible to bypass the cross-domain request limitation?

Yes, but not necessarily due to the fact that the JS file is from the same domain. The actual URL of the script doesn't play a significant role in this scenario.

Answer №3

When looking for alternatives to JSONP, I suggest exploring Cross Origin Resource Sharing.

All the owner of the service has to do is include a header specifying the authorized origins (whether static, dynamic, or open).

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