Why Is My HTML Output Displaying as Plain Text in Go?

Unexpected HTML Output as Plain Text

A common misconception arises when HTML output is interpreted as plain text instead of being received as HTML. This issue stems from a misunderstanding in the default behavior of Go's HTTP handler.

In the provided code sample, a request handler is configured to generate and display an HTML template named "base.html" at port 9999. However, upon loading the page, the HTML markup appears verbatim within a preformatted block. This unexpected result is due to the template being rendered as plain text by the server.

To rectify this issue, it is necessary to explicitly set the Content-Type header of the HTTP response to inform the client that the output is HTML. This ensures that the browser can interpret the HTML content and render it appropriately.

The following modification should resolve the problem:

<code class="go">requestHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    // Set the Content-Type header
    w.Header().Set("Content-Type", "text/html")
    
    t := template.New("test")
    t, _ := template.ParseFiles("base.html")
    t.Execute(w, "")
})</code>

After implementing this change, the HTML template should be rendered and displayed as expected within the browser.

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