(Newbie) Confusion on http fileserver default path

I am trying to figure out the following discrepancy in behavior for http.Handle

Consider this directory structure

myproject
    static
        index.html

And this code

fs := http.FileServer(http.Dir("./static"))
http.Handle("/", fs)
http.ListenAndServe(":8080", nil)

running the above code and hitting http://localhost:8080/ or http://localhost:8080/index.html I will see the index.html served

however if I do something like this

fs := http.FileServer(http.Dir("./static"))
http.Handle("/test/", fs) // Comment: OR http.Handle("/test", fs)
http.ListenAndServe(":8080", nil)

running the above code and hitting http://localhost:8080/test or http://localhost:8080/test/index.html I will see 404 and no index.html

I feel this is a super rookie mistake, but I just can't wrap my head around it.

Can someone help me out?

Look at the second example here.

As the ROFLLOLSTER example shows, the FileServer will use the URL path to look into "./static". So it will look for "./static/test/index.html". You thus have to remove the segment of the path you don't want to be part in the file lookup.