FLASH® LITE™ 2.x - Adobe Help and Support

This causes Flash Player to attempt to retrieve a policy file from the specified host and port.
Any port can be used, not only ports 1024 and higher. Upon establishing a connection with
the specified port, Flash Player transmits , terminated by a null
byte. An XMLSocket server can be configured to serve both policy files and normal
XMLSocket connections over the same port, in which case the server should wait for
before transmitting a policy file. A server can also be set up to
serve policy files over a separate port from standard connections, in which case it can send a
policy file as soon as a connection is established on the dedicated policy file port. The server
must send a null byte to terminate a policy file, and may thereafter close the connection; if the
server does not close the connection, Flash Player does so upon receiving the terminating
null byte.
A policy file served by an XMLSocket server has the same syntax as any other policy file,
except that it must also specify the ports to which access is granted. When a policy file comes
from a port lower than 1024, it can grant access to any ports; when a policy file comes from
port 1024 or higher, it can grant access only to other ports 1024 and higher. The allowed
ports are specified in a "to-ports" attribute in the tag. Single port
numbers, port ranges, and wildcards are all allowed. The following example shows an
XMLSocket policy file:
A policy file obtained from the old default location--/crossdomain.xml on an HTTP server on
port 80—implicitly authorizes access to all ports 1024 and above. There is no way to retrieve
a policy file to authorize XMLSocket operations from any other location on an HTTP server;
any custom locations for XMLSocket policy files must be on an XMLSocket server.
Because the ability to connect to ports lower than 1024 is new, a policy file loaded with
loadPolicyFile() must always authorize this connection, even when a movie clip is
connecting to its own subdomain.
Parameters
url:String - A string; the URL where the cross-domain policy file to be loaded is located.
Selection
Object
542 ActionScript classes