Why Is My Go http.FileServer Serving Outdated Files When Using Virtual Box Shared Folders?

Caching Issues with http.FileServer in Go

The http.FileServer in Go is designed to serve static files from a given file system, providing an efficient and convenient way to host web content. However, certain circumstances can lead to unexpected caching behavior, resulting in outdated files being served.

One such issue arises when using Virtual Box shared folders to store files for http.FileServer. In this scenario, the problem is related to the synchronized access of these files between the host and guest operating systems.

To illustrate, let's consider the example provided:

<code class="go">http.Handle("/", http.FileServer(http.Dir("./www/")))
err := http.ListenAndServe(":8080", nil)
if err != nil {
    fmt.Println(err)
}</code>

With an HTML file like:

<code class="html">


    <p>Hello there</p>

</code>

When initially served, the content is displayed correctly, and the response headers show the appropriate content length and last modified timestamp.

However, upon making changes to the HTML file and reloading the page, the original content is still displayed. This is because the modified file is not being properly cached by the operating system due to the synchronization issues between the host and guest. This behavior is observed even after exiting and restarting the program.

The solution to this problem is to avoid using Virtual Box shared folders when hosting files for http.FileServer. By storing the files on the guest operating system directly, the synchronization issues are eliminated, allowing the file server to cache files correctly and serve the updated content.

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