How to Create an Optional URL Variable with Gorilla Mux?

Optional URL Variable with Gorilla Mux

This question asks how to create a route with an optional URL variable using the Gorilla Mux package. The provided route defines a regex constraint for the id variable. However, it doesn't allow the route to work without an id.

Solution:

To make the route accept an optional id, register the handler a second time with the path you want without the variable:

r.HandleFunc("/view", MakeHandler(ViewHandler))

Ensure you check for the case where the id variable is not present when getting the variables:

vars := mux.Vars(r)
id, ok := vars["id"]
if !ok {
  // directory listing
  return
}
// specific view

This will allow the route to work both with and without the id URL variable.

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