使用大猩猩多路复用器路由器时，如何忽略一个单词并匹配所有其他单词？

For example, I have a func that handles "/items/{item-id}" and another func that handles "/items/request-task". How to make the first func ignores "/items/request-task" and match the rest?

like this.

package main

import (
    "net/http"

    "github.com/gorilla/mux"
)

func main() {
    r := mux.NewRouter()
    r.HandleFunc("/items/request-task", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("task."))
    }) // task HandleFunc before other
    r.HandleFunc("/items/{item-id}", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("other."))
    })
    http.Handle("/", r)
    http.ListenAndServe(":8080", nil)
}