What is localhost:8000 as used in Codecademy (for AngularJS and Ruby

ruby 8000A ruby process (PID 25560) is making a connection to localhost:8000 (from port 45789, which was probably dynamically allocated). That is, ruby is making a normalThe default timestamp rate is 8000 Hz, but other rates may be defined. RTP & Volatility. SIP-ALG-Detector is an utility to detect routers with SIP ALG enabled. Extra 10%