Golang http.FileServer returns 404 not found

php Editor Banana will introduce you to a common problem in Golang, that is, a 404 not found error is returned when using http.FileServer. When building web applications using Golang, we often use http.FileServer to serve static files. However, sometimes you will encounter a 404 not found problem when accessing static files. This article will help you solve this problem and provide some common solutions.

Question content

There is this simple fragment:

fs := http.FileServer(http.Dir("./web/js"))
    http.Handle("/js/", http.StripPrefix("/js/", fs))

and going to /js/ actually lists the file, but when I try to open the actual file it says 404 Not Found

$ curl http://localhost:8100/js/
<pre class="brush:php;toolbar:false">
<a href="test.js">test.js</a>

$ curl http://localhost:8100/js/test.js 404 page not found

Any suggestions? This seems like a super trivial question.

Workaround

The problem is not in the code snippet, but in obscuring the details, like using gorilla/mux, which serves the files in a different way, like this solution As pointed out in:

solution

TLDR:

import  "github.com/gorilla/mux"

// snip

router := mux.NewRouter()
fs := http.FileServer(http.Dir("./web/js"))
router.Handle("/js/{.js}", http.StripPrefix("/js/", fs))

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