TCP/IP is a standard that takes a long time to implement well. I've had to implement TCP/IP exactly once in my career (maybe a couple times more if you count j

TCP/IP is a standard that takes a long time to implement well. I've had to implement TCP/IP exactly once in my career (maybe a couple times more if you count just "lobbing" crafted datagrams), but I've just "used" existing implementations hundreds of times. Similarly, HTTP is a big standard that takes a long time to implement well. But very few people will have to implement it: they will use existing implementations.