SendFile

Transfers the file from the given path. Sets the Content-Type response HTTP header field based on the filenames extension.

c.SendFile(path string, compress ...bool) error

app.Get("/not-found", func(c *fiber.Ctx) {
  if err := c.SendFile("./public/404.html"); err != nil {
    c.Next(err) // pass err to ErrorHandler
  }
  // Enable compression
  if err := c.SendFile("./static/index.html", true); err != nil {
    c.Next(err) // pass err to ErrorHandler
  }
})