Flex AMF channel problem only with few IE8 installation
Hi,
I had the same problem and in my opinion I found out a flexible solution which is working well with all browsers. This solution is tested for: Flex 3.4, flash player 10,0,32,18 and the latest Blaze DS in august 2009. But should work even in other configurations.
First you should definetly take a look at this post in order to understand deeply the problem: click here
Abstract of the solution:
Define channelSet with two channels: amfChannel as a default one and httpChannel as second one. Then delegate to Flex to handle for you when your browser has troubles with AMF (like some IE8) and Flex will switch automatically to httpChannel if necessary.
Analyze the log file first to be sure that the solution is what you need:
In the following log file you can see the same classical "HTTP: Status 200" problem which is the root of all troubles. The channelSet initially adds
two channels amfChannel and httpChannel. Then a method myFirstMethod(myFirstParameter) has been invoked over the remoteObject.
As you see the default channel amfChannel fails and Flex is trying with the httpChannel and then succeeds.
The PROVE: IE8 having troubles with AMF and switching to HTTP, log file:
14:03:52.375 INFO Channel : 'amfChannel' channel endpoint set to http://localhost:8080/backend/messagebroker/amfpolling
14:03:52.375 INFO Channel : 'httpChannel' channel endpoint set to http://localhost:8080/backend/messagebroker/http
14:03:52.390 INFO Producer : 'E095D162-76F4-61C5-EA47-15227D7881AA' producer set destination to 'be-destination-oe'.
14:03:52.390 DEBUG 1_ServiceDelegate : CALL service=setUser args=0001...
14:03:52.390 INFO Producer : 'E095D162-76F4-61C5-EA47-15227D7881AA' producer sending message '96918781-BFB2-2346-9CFE-15227D88AA0A'
14:03:52.390 DEBUG Channel : 'amfChannel' pinging endpoint.
14:03:52.578 DEBUG Channel : 'amfChannel' channel got status. (Object)#0
code = "NetConnection.Call.Failed"
description = "HTTP: Status 200"
details = "http://localhost:8080/backend/messagebroker/amfpolling"
level = "error"
14:03:52.578 INFO Channel : 'amfChannel' channel polling stopped.
14:03:52.578 ERROR Channel : 'amfChannel' channel connect failed.
14:03:52.578 WARN Producer : 'E095D162-76F4-61C5-EA47-15227D7881AA' producer channel faulted with Channel.Connect.Failed NetConnection.Call.Failed: HTTP: Status 200: url: 'http://localhost:8080/backend/messagebroker/amfpolling'
14:03:52.640 INFO Channel : 'httpChannel' channel is connected.
14:03:52.640 DEBUG Channel : 'httpChannel' channel sending message:
(mx.messaging.messages::RemotingMessage)#0
body = (Array)#1
[0] "myFirstParameter"
clientId = (null)
destination = "be-destination-oe"
headers = (Object)#2
messageId = "96918781-BFB2-2346-9CFE-15227D88AA0A"
operation = "myFirstMethod"
source = (null)
timestamp = 0
timeToLive = 0
14:03:52.656 INFO Producer : 'E095D162-76F4-61C5-EA47-15227D7881AA' producer connected.
14:03:52.687 INFO Producer : 'E095D162-76F4-61C5-EA47-15227D7881AA' producer acknowledge of '96918781-BFB2-2346-9CFE-15227D88AA0A'.Solution in details
1) Server side
1.1. remote-config.xml
* be sure to define amf & http channel in the tag <default-channels>
* destination with id = "backend-destination"
1.2. proxy-config.xml -> be sure to define amf & http channel in the tag <default-channels>
1.3. message-config.xml -> be sure to define amf & http channel in the tag <default-channels>
1.4. service-config.xml -> you should have uncommented both channels - amf & http
2) Client side
2.1. RemoteObjectFactory:
package andrewstoev.flex.services
{
import mx.messaging.Channel;
import mx.messaging.ChannelSet;
import mx.messaging.channels.AMFChannel;
import mx.messaging.channels.HTTPChannel;
import mx.rpc.remoting.mxml.RemoteObject;
public class RemoteObjectFactory
{
private static var AMF_CHANNEL:String = "AMF";
private static var HTTP_CHANNEL:String = "HTTP";
private static var AMF_ENDPOINT:String = "http://localhost:8080/backend/messagebroker/amfpolling";
private static var HTTP_ENDPOINT:String = "http://localhost:8080/backend/messagebroker/http";
private function createChannel(channelType:String):Channel{
switch(channelType){
case AMF_CHANNEL: return new AMFChannel("amfChannel", AMF_ENDPOINT);
case HTTP_CHANNEL: return new HTTPChannel("httpChannel", HTTP_ENDPOINT);
default: return null;
}
}
private function createChannelSet():ChannelSet{
var amfChannel:Channel = createChannel(AMF_CHANNEL);
var httpChannel:Channel = createChannel(HTTP_CHANNEL);
var channelSet:ChannelSet = new ChannelSet();
channelSet.addChannel(amfChannel);
channelSet.addChannel(httpChannel);
return channelSet;
}
public function createRemoteObject():RemoteObject
{
var channelSet:ChannelSet = createChannelSet();
var ro:RemoteObject = new RemoteObject();
ro.endpoint=AMF_ENDPOINT;
ro.channelSet=channelSet;
ro.destination="backend-destination";
return ro;
}
}
}2.2. How to use it
var ro:RemoteObject = new RemoteObjectFactory().createRemoteObject();
ro.myFirstMethod(myFirstParameter);
Cheers 
