为什么使用strophe.js的XMPP客户端仍在使用包括flXHR.js？

Question

I am using ejabberd as XMPP server,one of our project need to have a xmpp web client,for that i am referring Professional "XMPP Programming with JavaScript and jQuery" by jake moffitt i was going through chapter 3 hello world application ,here in order to make xmpp web client using strophe i have to include creating java script file such as strophe.js,flXHR.js,and strophe.flxhr.js

i have gone through example many time but failed to connect with the server, when i checked bosh connection using localhost:5280/http-bind it is working fine!!!!!

with try and error when i try to connect with xmpp server with removing flXHR.js ,it magically got connected to xmpp server!!!!!

FLxhr.js is used for making cross domain call as per book" Flash has a strict security policy, but unlike JavaScript, it allows cross-domain requests to be sent to domains that permit such requests."

If i bypass above FLxhr.js i have to use a proxies

i am using apache tomcat as web-app server ,i haven't setup any proxies and not included FLxhr.js file in my html page ,but still xmpp client is able to communicate with server!!

Can some one please explains me what is the reason behind this??

thanks in advance!!

Answer 1

It's likely that your XMPP server has CORS enabled, I know Openfire now supports this. With CORS, strophe.js is able to make a cross origin request without needing the workaround provided by flash(FLxhr.js), and also works without any server side redirects.

Cross-Origin Resource Sharing

Cross Domain AJAX for XMPP HTTP-Binding Made Easy

CORS Browser Support

If you want to quickly check to see if your XMPP server has CORS enabled, you should be able to locate a crossdomain.xml file hosted on the root of your server.

Example:

I connect Strophe to my XMPP server using the address http://192.168.0.26:7070/http-bind/ .

Since I have CORS enabled, I can browse to http://192.168.0.26:7070/crossdomain.xml and the server will return an XML file.