Process HTTP requests and WebSocket messages. Even if a server exists, no
requests are serviced unless and until
service is called.
Approximate number of milliseconds to run before returning. If 0, then the function will continually process requests without returning unless an error occurs.
Note that while
service is waiting for a new request, the process is
not interruptible using normal R means (Esc, Ctrl+C, etc.). If being
interruptible is a requirement, then call
service in a while loop
with a very short but non-zero
Sys.sleep during each iteration.
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