Type '{' '}' in url

Just type the URL:

\documentclass{article}
\usepackage{url}
\begin{document}
\url{http://foo.bar/orders{orderID}}
\end{document}

With hyperref it's the same, but the result is an invalid URL, I guess.

With hyperref, for fun (egreg was tooooo fast with url ;)...)

\documentclass{article}
\usepackage{hyperref}
\begin{document}
  \href{http://foo.bar/orders{orderID}}{\texttt{http://foo.bar/orders\{orderID\}}}
\end{document}