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by lukatmyshu 5969 days ago
Plus w/ jsonp can't get the response from POST requests and you don't get notification that your page didn't load. So your web-stack needs to be able to handle sending any errors via jsonp as well.

In any case, they don't solve the same problem. Jsonp solves the problem of talking to another domain (PostMessage does the same thing). Channels solve the problem of the browser limiting the number of concurrent HTTP requests you can have open to one domain.