What makes this a problem? The initial request to Polyglot is also "push". The rest of the web works on "push" too; pull in this case would only help if you do

What makes this a problem? The initial request to Polyglot is also "push". The rest of the web works on "push" too; pull in this case would only help if you don't care that a request could take a long time (seconds) to resolve. I didn't see mention of it, but what happens if a message is not responded to? How does Polyglot handle time outs?