Append
Appends the specified value to the HTTP response header field.
If the header is not already set, it creates the header with the specified value.
c.Append(field, values ...string)
app.Get("/", func(c *fiber.Ctx) {
c.Append("Link", "http://google.com", "http://localhost")
// => Link: http://localhost, http://google.com
c.Append("Link", "Test")
// => Link: http://localhost, http://google.com, Test
})