Spring security logout

Hello,

I using spring security function for logout, the function look like below
public void configure(HttpSecurity http) throws Exception {
      http
          .logout().logoutSuccessUrl("/").and()
          .authorizeRequests().antMatchers("/index.html", "/app.html", "/")
          .permitAll().anyRequest().authenticated().and()
          .csrf()
            .csrfTokenRepository(CookieCsrfTokenRepository.withHttpOnlyFalse());
    }

but the above code giving error code 403 or 404.

Kindly anyone help me out in this.

Thanks
Anita