Failed to fetch from swagger

[suntong]

Description of the bug

When testing the API from swagger, I always get "Failed to fetch" error.
Doing it on CLI is fine though.

Steps To Reproduce

1. Go to http://my.server.name:5050/docs/
2. Test the "Register" API from swagger

Additional Information

The reason that I'm reporting here is that, I'm also trying another template -- https://github.com/create-go-app/fiber-go-template/, which seems to be doing no difference than what you're doing regarding CORS:

package middleware

import (
        "github.com/gofiber/fiber/v2"
        "github.com/gofiber/fiber/v2/middleware/cors"
        "github.com/gofiber/fiber/v2/middleware/logger"
)

// FiberMiddleware provide Fiber's built-in middlewares.
// See: https://docs.gofiber.io/api/middleware
func FiberMiddleware(a *fiber.App) {
        a.Use(
                // Add CORS to each route.
                cors.New(),
                // Add simple logger.
                logger.New(),
        )
}

Yet, its CORS/swagger is working just fine:

What could possibly cause the difference?
How can I make the swagger work out of the box please?

[solrac97gr]

I will take a look about this, considering I am also using the CORS middleware.