julienschmidt/httprouter ? reverse-engineered prompt

Build me a small Go HTTP router library like HttpRouter that’s fast and simple to use.

I want it to match routes exactly, support request methods, named path params like /hello/:name, and catch all paths like /src/*filepath. It should automatically handle trailing slash redirects, clean up bad paths like double slashes or ../, and optionally do case insensitive lookups. Please include custom NotFound, MethodNotAllowed, OPTIONS handling, and a panic recovery handler so the server doesn’t crash. It should also support serving static files.

The main goal is performance, so keep allocations very low and use a compact tree based matcher under the hood. Make the public API feel natural for Go, with simple handler registration and a clear way to read params from the request or handler arguments. Add a few examples and tests that show normal routing, params, redirects, and error cases. If you need to check current Go docs or best practices, look them up online.