Sets the throttle delay and send buffer size.
Provides a basic throttling mechanism, which will yield the current process respectively thread until the entity has been completely sent.
This may not work as expected with the following SAPI(s): FastCGI.
Send file with approximately 20 kbyte/s.
// ~ 20 kbyte/s
# http_throttle(1, 20000);
# http_throttle(0.5, 10000);