从远程服务器调用JavaScript函数

Question

I tried to call JavaScript function exist on some server(server1) from another server(server2) and I got this error:

Unsafe JavaScript attempt to access frame with URL https://server1/ from frame with URL https://server2/ . Domains, protocols and ports must match.

I used JSP, Java, JavaScript and tomcat7, is there any way to solve this problem? any help will be appreciated.

Answer 1

Yes, must add a cross-origin rule to the header of your javascript file, which allows access from your other server.

Otherwise, your Browser doesn´t let you do that.

You can look at the answer of this Question: XmlHttpRequest error: Origin null is not allowed by Access-Control-Allow-Origin

It should tell you how to do it.

Answer 2

Take a look at easyXDM - it provides an RPC feature allowing you to call methods across the Same Origin Policy .

Take a look at one of the demo's here

Answer 3

As described you are subject to the Same Origin Policy, this is designed to protect users. Google have a good write-up: http://code.google.com/p/browsersec/wiki/Part2 .

There are several typical approaches to working around this:

1. jquery has a getJson or jsonp type of function. most other js libs have something similar. They use a dynamic Script tag, suitable for GET requests from other domains.
2. Create a servlet on domain1 that proxies to domain2 - allows unrestricted HTTP methods and use of XmlHTTPRequest.

I've not tried http://easyxdm.net/wp/

There are improvements coming, like cross document messaging in HTML5