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As mentioned in #64, looks that failures to handle '/xhr_send' urls - like reponding with 404, do not result in the session getting abruptly closed. It should.
Our JSONP transport sends data by submitting a form to '/jsonp_send' url. The form target field is set to an unique iframe - to avoid reloading the whole page on form submit.
The problem is - there is no way to get information if this iframe succeeded or failed - it's cross domain iframe and we know only that it 'loaded'.
So - we have to hardcode success for sending data on jsonp transport.
Fix #66: failure to post data to /xhr_send should kill the session