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For the complete lowdown on rpc in Flex (including a 3rd RPC object, WebService), check out the following livedocs page:
HTTPService and FDS both are use for send data from flex to middle ware
like php, coldfusion, .net etc. HTTPService used HTTP Get and Post Methode.
If you are using LiveCycle Data Services, you have the option of connecting to RPC services directly by specifying URLs in ActionScript or connecting to destinations defined in the services-config.xml file or a file that it includes by reference. A destination definition is a named service configuration that provides server-proxied access to an RPC service. A destination is the actual service or object that you want to call. A destination for a RemoteObject component is a Java object defined as a Remoting Service destination. A destination for an HTTPService component is a JSP page or another resource accessed over HTTP. A destination for a WebService component is a SOAP-compliant web service. You configure HTTP services and web services as Proxy Service destinations.
or more detail you will be get from this link: