Serve default page for all subdirs of URL

Question

I would like to call FileServer in such way, that it serves the same page for all subdirectories of distinct directories (subdirs).

The naïve approach, of course, does not work:

  for _, prefix := range subdirs {
     fsDist := http.FileServer(http.Dir(defaultPage))
     r.PathPrefix(prefix).Handler(http.StripPrefix(prefix, fsDist))
  }

Because /abc/123 is mapped to defaultPage/123 and I need just defaultPage.

For example, if subdirs := []string{"abc", "xyz"}, it should be mapped like this:

    abc/xyz => defaultPage
    abc/def => defaultPage
    xyz/aaa => defaultPage

I understand that I need something like http.SetPrefix or something like that, but there is nothing of that kind. Of course, I could write my own handler, but I wonder what is the standard approach here?

The task is pretty common, and I suppose there should be some standardized approach?

Answer 1

EDIT: multiple-route support & static file-serving:

---

It sounds like you just want:

r := mux.NewRouter()
r.HandleFunc("/products", ProductsHandler) // some other route...

staticFilePath := "catch-all.txt"

fh := http.HandlerFunc(
    func(w http.ResponseWriter, r *http.Request) {
        http.ServeFile(w, r, staticFilePath)
    },
)

for _, dir := range []string{"abc", "xyz"} {
    r.PathPrefix("/" + dir + "/").Handler(fh)
}

Working example (run outside playground): https://play.golang.org/p/MD1Tj1CUcEh

$ curl localhost:8000/abc/xyz
catch all

$ curl localhost:8000/abc/def
catch all

$ curl localhost:8000/xyz/aaa
catch all

$ curl localhost:8000/products
product