Twisted - How can one expose a Protocol to the internet so it can be called via an HTTP POST?

Question

So protocols allow asynchronous functionality but only on the TCP level.

from twisted.internet import reactor, protocol, endpoints

class UpperProtocol( protocol.Protocol ):
    def connectionMade( self ):
        self.transport.write( "Convet to Uppercase !\n" )

    def connectionLost( self, reason ):
        pass

    def dataReceived( self, data ):
        self.transport.write( data.upper() )
        self.transport.loseConnection()


factory = protocol.ServerFactory()
factory.protocol = UpperProtocol

#reactor.listenTCP( 8000, factory )
endpoints.serverFromString( reactor, "tcp:8000" ).listen( factory )
reactor.run()

I can do a POST request with this:

from twisted.internet import reactor, endpoints
from twisted.web.resource import Resource
from twisted.web.server import Site
import intent

import cgi

class UpperCaller(Resource):
    def render_POST(self, request):
        text            = request.args[ "text" ][ 0 ]
        response        = text.upper()
        return cgi.escape( response )

root = Resource()
root.putChild( "upper", UpperCaller() )
factory  = Site( root )
endpoint = endpoints.TCP4ServerEndpoint( reactor, 8880 )
endpoint.listen( factory )
reactor.run()

How can I call the protocol to be used whenever a post request arrives ? If done via the POST server it will not be asynchronous like the Protocol call from Telnet would be.

How can I made it work via a POST call ? I would like to let it be an API call where I pass text and it returns the output by calling the protocol.