How to Hide HTML File Extensions from URLs in a Go HTTP Server?

How to Conceal File Extensions in a Simple HTTP Server

Many web servers display file extensions in the URL, which can be undesirable for aesthetic or user-experience reasons. This guide demonstrates how to conceal the .html extension from URLs in a Go HTTP server.

Solution

Implement http.FileSystem using http.Dir offers several benefits, including leveraging the robust code within http.FileServer. A custom HTMLDir struct can be created to implement this functionality.

Implementation

The implementation of Open depends on the desired behavior. Three scenarios are presented below:

Option 1: Always Append .html

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

Option 2: Fallback to .html

<code class="go">func (d HTMLDir) Open(name string) (http.File, error) {
    f, err := d.d.Open(name)
    if os.IsNotExist(err) {
        if f, err := d.d.Open(name + ".html"); err == nil {
            return f, nil
        }
    }
    return f, err
}</code>

Option 3: Start with .html and Fallback

<code class="go">func (d HTMLDir) Open(name string) (http.File, error) {
    f, err := d.d.Open(name + ".html")
    if os.IsNotExist(err) {
        if f, err := d.d.Open(name); err == nil {
            return f, nil
        }
    }
    return f, err
}</code>

By using HTMLDir with http.StripPrefix, the .html extension can be effectively concealed when serving files from the specified directory. This technique provides a more seamless and aesthetically pleasing user experience, while still allowing access to the intended content.

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