Process requests — service • httpuv

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, later::run_now() is called).

Usage

service(timeoutMs = ifelse(interactive(), 100, 1000))

Arguments

timeoutMs: 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.

Details

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 later::run_now(), so if your application schedules any later::later() callbacks, they will be invoked.

Examples

if (FALSE) { # \dontrun{
while (TRUE) {
  service()
}
} # }