I'm pretty new to Autobahn and WAMP (Web Apps Messaging Protocol). I'm just creating a simple Application Component based on [this documentation](web.archive.org/web/20140417162256/http://autobahn.ws/python/wamp/programming.html] and and this example My server-side Python code: from autobahn.asyncio.wamp import ( ApplicationSession, ApplicationRunner ) from autobahn import wamp from asyncio import coroutine class MyComponent(ApplicationSession): @wamp.register("com.myapp.add2") def add2(self, x, y): print("added 2") return x + y @wamp.register("com.myapp.add3") def add3(self, x, y, z): print("added 3") return x + y + z @coroutine def onJoin(self, details): res = yield from self.register(self) print("{} procedures registered.".format(len(res))) if __name__ == '__main__': runner = ApplicationRunner(url="ws://localhost:8080/ws", realm="realm1") runner.run(MyComponent) And the client-side code <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> </head> <body> <script>AUTOBAHN_DEBUG = false;</script> <script src="http://autobahn.s3.amazonaws.com/autobahnjs/latest/autobahn.min.jgz"></script> <script> var connection = new autobahn.Connection({ url: "ws://localhost:8080/ws", realm: "realm1" }); connection.onopen = function (session, details) { session.call("com.myapp.add2", [2,3]).then(session.log); session.call("com.myapp.add3", [2,3,4]).then(session.log); }; connection.onclose = function (reason, details) { console.log("Connection lost: " + reason); }; connection.open(); </script> </body> </html> Error: Looks like this is similar to https://github.com/hwmrocker/hextest/issues/2 but I can't get my head around. I can't even find a sample that works. This one (https://github.com/tavendo/AutobahnPython/tree/master/examples/asyncio/wamp/wamplet/wamplet1) is similar but it has the same issue as well. Surprisingly, when I run an external Crossbar sample on the same Port and run the above example, it works like a magic and I can see the results on the console. I found this one (https://github.com/tavendo/AutobahnPython/blob/master/examples/asyncio/wamp/basic/server.py) but it looks quite complicated. Continue reading...