If the user has a flaky connection, we might be in the backoff state
of attempting a reconnect. But when the user regains connectivity
and tries to send, we want to send the message as soon as possible.
(imported from commit 3c5c8e9c3104ff7923258f73c9ab700548518d16)
There seems to be some sort of bug involving PhantomJS and XHR
streaming messages. When successive pages are loaded that use XHR
streaming, PhantomJS seems to think the second one never finishes
loading and therefore hangs.
(imported from commit db93b4cab816f1fdc3f3f543c9394b1cba8abedb)
Because our authentication system reads cookies from the initial
connection attempt, several SockJS transports can't be used.
(imported from commit 34b9571225d39072985b8223fb12c43c7235841f)
Zev Benjamin