Performance bug in HTTP library affecting "cabal update"

[Thomas Schilling]

Hi Ganesh and Mark,

I just sent a pull request to the HTTP library [1] that dramatically
improves the performance of "cabal update" (80s -> 8s on my machine).
It would be nice if we could make a new release soon and compile the
next Platform's "cabal-install" against it.

Mark, any concerns?

[1]: https://github.com/haskell/HTTP/pull/48