미리 정의된 경로 없이 Go에서 URL 매개변수를 추출하는 방법은 무엇입니까?

<code class="go">package main

import (
    "fmt"
    "log"
    "net/http"

    "github.com/gorilla/mux"
)

func main() {
    // Create a new router
    r := mux.NewRouter()

    // Define a route that matches any URL path and calls the handler function
    r.HandleFunc("/{anyPath:.+}", handler)

    // Start listening on port 8080
    log.Fatal(http.ListenAndServe(":8080", r))
}

// Handler function to read and print the URL path
func handler(w http.ResponseWriter, r *http.Request) {
    // Get the URL path from the request
    path := r.URL.Path

    // Print the path
    fmt.Fprintf(w, "URL path: %s\n", path)
}</code>