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Why Does Go Send HTML Output as Plain Text in a Template?

Barbara StreisandOriginal: 2024-10-28 06:53:29985browse

Go HTML Output as Plain Text

Consider the following code setup:

<code class="go">requestHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    t := template.New("test")
    t, _ := template.ParseFiles("base.html")
    t.Execute(w, "")
})

server := &http.Server{
    Addr:           ":9999",
    Handler:        requestHandler,
    ReadTimeout:    10 * time.Second,
    WriteTimeout:   10 * time.Second,
    MaxHeaderBytes: 1 << 20,
}

log.Fatal(server.ListenAndServe())

The "base.html" file contains the following HTML:

<code class="html"><!DOCTYPE html>
<html>
    <body>
        base.html
    </body>
</html></code>

Upon running the server and navigating to the page, the HTML from the template is displayed verbatim, enclosed within

 tags and a new document wrapper.</p>
<p>The reason for this behavior lies in the absence of a "Content-Type" header for the response. By default, Go treats the output as plain text. To correct this, add the following line before executing the template:</p>
<pre class="brush:php;toolbar:false"><code class="go">w.Header().Set("Content-Type", "text/html")</code>

With this adjustment, the browser will correctly interpret the output as HTML and render it appropriately.

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