How can I read the POST data in AS3? - actionscript-3

Question

I am creating the below url request which launches a flex application through the mentioned url. I have also added data and set url req method to POST. How can I read this POST data in my Flex Application which is being launched
var urlReq:URLRequest = new URLRequest();
var requestVars:URLVariables = new URLVariables();
requestVars.id = 'abc';
urlReq.data = requestVars;
urlReq.method = URLRequestMethod.POST;
urlReq.url = '../../bin-debug/FlexApp.html';
navigateToURL(urlReq);

Answer 1

Could you pass your variables within the url and then use flashvars via swfobject to pass them to the target app?
I've had more or less similar issue, and used this method.
In my first swf:
var urlReq:URLRequest = new URLRequest(String("game.html?user_id="+userId+"&user_code="+userCode));
And then in game.html I parsed those variables and sent then as flashvars:
<script type="text/javascript" src="swfobject.js"></script>
<script type="text/javascript">
function getUrlVars() {
var vars = {};
var parts = window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi,
function(m,key,value) {
vars[key] = value;
});
return vars;
};
var flashvars = {
user_id: getUrlVars()["user_id"],
user_code: getUrlVars()["user_code"]
};
var params = {
quality: "high",
bgcolor: "#000000",
play: "true",
loop: "true",
wmode: "window",
scale: "showall",
menu: "true",
devicefont: "false",
allowScriptAccess: "true"
};
swfobject.embedSWF("preloader.swf", "flashContent", "980", "663", "11.2.0",false, flashvars, params);
</script>
And finally in my target swf I received them like this:
var userId:String = loaderInfo.parameters.user_id as String;
var userCode:String = loaderInfo.parameters.user_code as String;
I hope this helps, and if not, then I probably didn't understand the main issue.

Answer 2

The POST data is sent to the server, so if you want to read it on FlexApp.html from the client then the server needs to echo it back on that page somehow. Otherwise you could use a GET request and access the request parameters using JavaScript window.location.search.
Here's an example using PHP to output the POST variables as JSON to the page:
<script>
var post_params = <? echo json_encode($_POST); ?>
function getPostParam(name){
return post_params[name];
}
</script>
Call from JavaScript:
alert(getPostParam("id"));
Call from ActionScript:
trace(ExternalInterface.call("getPostParam", "id"));