🤔 app.Static serving JS as text/plain

[fhammoud]

Question description
I'm not sure if this is a bug or if I'm doing this wrong, but I created an Angular 9 app to be served by my Fiber app. The Angular app compiles the output to /public. When I add the app.Static middleware I can see that all my angular files have been sent but the JS files have the mime-type text/plain instead of application/javascript, and so the browser is throwing an error: "Failed to load module script: The server responded with a non-JavaScript MIME type of "text/plain". Strict MIME type checking is enforced for module scripts per HTML spec."

Code snippet (optional)

package main

import (
	"fmt"
	"github.com/gofiber/fiber"
	"github.com/gofiber/logger"

	"fiber/api/car"
)

func main() {
        app := fiber.New()

        // Add middleware
	app.Use(logger.New())

	// Serve static files
	app.Static("/", "./public")

	// Setup routes
	car.Routes(app)

	// Start Fiber server
	err := app.Listen(8080)
	if err != nil {
		fmt.Print("Failed to start server")
	}
}

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[Fenny]

@fhammoud, what OS are you running on and do the javascript files have the .js extension?

[fhammoud]

I'm on Windows 10, and yes they do have .js extension. They're the typical Angular app files if you're familiar with Angular. However, the CSS file has the correct type of text/css.

[fhammoud]

@thomasvvugt Helped me with this. The issue was wrong Content Type defined for .js in the Windows registry.
In case anyone else sees this, open regedit, go to HKEY_LOCAL_MACHINE > SOFTWARE > Classes > .js (or any other file extension you need). Then modify the Content Type field.

[thomasvvugt]

Issue is open on Go itself as well.
See golang/go#32350