Flex error on using HTTP Service

Hi I'm trying a simple tutorial of retrieving RSS feeds from yahoo and keep getting this error:

RPC Fault faultString="Security error accessing url" faultCode="Channel.Security.Error" faultDetail="Destination: DefaultHTTP"

I've seen some articles that开发者_运维问答 say I need a crossdomain.xml file, but I don't really know how to set this file up and how to use it from the Flex SDK compiler (mxmlc).

Thanks

The crossdomain.xml file needs to live at the root of the server that you are accessing. If they have not put that there, then you are out of luck when running in the browser. It is part of an important security aspect of running in a browser sandbox (Silverlight has the same restriction). It is waived if you are running in Air (or pretty much anything out of the browser).

Lets say that you are trying to receive data from http://foo.com/rest/rss/all (or something like that). You can chec quickly to see if they allow cross-site scripting (XSC) by browsing to http://foo.com/crossdomain.xml. If it is not there, then you can't do it.

Still, the comments you got about more information would help us give you a better answer.