Gin router.Static can not run in https mode

router.Static can not run in https mode ，errors： http: TLS handshake error from [::1]:14521: remote error: tls: unknown certificate

package main

import (
    "github.com/gin-gonic/gin"
    "github.com/unrolled/secure"
)

func main() {
    router := gin.Default()
    router.Use(TlsHandler())

    router.Static("/html", "/html") //Static file handler
    // Ping handler
    router.GET("/ping", func(c *gin.Context) {
        c.String(200, "pong")
    })
    router.RunTLS(":8080", "cert.pem", "key.pem")
}

func TlsHandler() gin.HandlerFunc {
    return func(c *gin.Context) {
        secureMiddleware := secure.New(secure.Options{
            SSLRedirect: true,
            SSLHost:     "localhost:8080",
        })
        err := secureMiddleware.Process(c.Writer, c.Request)

        // If there was an error, do not continue.
        if err != nil {
            return
        }

        c.Next()
    }
}

Comment From: dropdevrahul

it means your certficate is not signed, what kind of certificae are you using?