Process HTTP requests and WebSocket messages. If there is nothing on R's call
stack – if R is sitting idle at the command prompt – it is not necessary to
call this function, because requests will be handled automatically. However,
if R is executing code, then requests will not be handled until either the
call stack is empty, or this function is called (or alternatively,
run_now is called).
Approximate number of milliseconds to run before returning. It will return this duration has elapsed. If 0 or Inf, then the function will continually process requests without returning unless an error occurs. If NA, performs a non-blocking run without waiting.
In previous versions of httpuv (1.3.5 and below), even if a server created by
startServer exists, no requests were serviced unless and until
service was called.
This function simply calls
run_now(), so if your
application schedules any
later callbacks, they will be
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