Re: Prior Art
That's not how copyright works.
Copyright is all about copying code (or music or ...). Copyright doesn't cover *ideas*. (Although the US courts have ruled that copyright can cover a single chord, or a big set of function prototypes).
So the fact that there are previous webservers that may have provided inspiration, or the APIs that solve the same problems as previous webservers may be similar just because they solve the same problem, is irrelevant. There's no allegation that any *code* was copied from the previous webservers.