How to Remove the .html Extension from URLs in a Go HTTP Server?

Remove .html Extension from Files in an HTTP Server

Many HTTP servers automatically add a ".html" extension to the end of URLs, which can be undesirable in some cases. To modify this behavior in a Go HTTP server, you can implement a custom http.FileSystem using http.Dir. Here's how:

1. Create a custom FileSystem:

<code class="go">type HTMLDir struct {
    d http.Dir
}</code>

2. Implement the Open method:

The Open method determines how files should be opened. Depending on your requirements, you have several options:

Always append ".html" extension:

<code class="go">func (d HTMLDir) Open(name string) (http.File, error) {
    return d.d.Open(name + ".html")
}</code>

Fallback to ".html" extension:

<code class="go">func (d HTMLDir) Open(name string) (http.File, error) {
    // Try name as supplied
    f, err := d.d.Open(name)
    if os.IsNotExist(err) {
        // Not found, try with .html
        if f, err := d.d.Open(name + ".html"); err == nil {
            return f, nil
        }
    }
    return f, err
}</code>

Start with ".html" extension and fallback:

<code class="go">func (d HTMLDir) Open(name string) (http.File, error) {
    // Try name with added extension
    f, err := d.d.Open(name + ".html")
    if os.IsNotExist(err) {
        // Not found, try again with name as supplied.
        if f, err := d.d.Open(name); err == nil {
            return f, nil
        }
    }
    return f, err
}</code>

3. Use your custom FileSystem:

<code class="go">fs := http.FileServer(HTMLDir{http.Dir("public/")})
http.Handle("/", http.StripPrefix("/", fs))</code>

By implementing http.FileSystem and customizing the Open method, you can control how files are served by your HTTP server, including the behavior around ".html" extensions.

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