gorilla/mux
HTTP router and URL matcher for building Go web servers
... be matched based on URL host, path, path prefix, schemes, header and query values, HTTP methods or using custom matchers, URL hosts, paths and query values can have variables with an optional regular expression. Also, registered URLs can be built, or "reversed", which helps maintaining references to resources, Routes can be used as subrouters: nested routes are only tested if the parent route matches. And many more features.