JavaScript & XMLHttpRequest

Question

Hello, I know that due to JavaScript security sandbox, it is not possible to load xml data from outside of the domain which the JavaScript code is on.

But if I am using the localhost:8080 and the xml document is coming from the localhost in the same machine but from another port like 8081, is this considered as same domain or not?

Thanks

andy e and ken and jacob, thank you all :-)

Answer 1

Different port is considered "different origin", and thus violates the same origin policy.

URL                                                Outcome   Reason
=================================================================================
http://store.company.com/dir2/other.html           Success   
http://store.company.com/dir/inner/another.html    Success   
https://store.company.com/secure.html              Failure   Different protocol
http://store.company.com:81/dir/etc.html           Failure   Different port
http://news.company.com/dir/other.html             Failure   Different host

Source(s): Same origin policy for JavaScript - MDC, Same origin policy - Wikipedia.

Answer 2

Typically the same origin policy you describe does consider a different port to be a different domain. The policy is enforced by each browser, so some may vary (the Wikipedia article says the TCP port is considered in the policy "in most browsers").