When I search for "htp pipelining" (google.com/search?q=htp+pipeli ...) Google says:

Did you mean: http pipelining

The link links to google.com/http+pipelining

That 404s for me. Either this is just a bug or Google is going to do something like A9 – urls such as a9.com/http%20pipelining.

It works here, but i recently heard of a similar case (dead link in a suggestion).