AjaxAuthenticationProvider&JwtAuthenticationProvider

[Mr. Black Tea]

Hello:
I have a problem on AjaxAuthenticationProvider and JwtAuthenticationProvider.
I see the configuration of both two in the WebSecurityConfig.
It likes that:

    @Override
    protected void configure(AuthenticationManagerBuilder auth) {
        auth.authenticationProvider(ajaxAuthenticationProvider);
        auth.authenticationProvider(jwtAuthenticationProvider);
    }

And I know that when I input '/login' ,it will enter AjaxLoginProcessingFilter , when I input '/api/me' ,it will enter JwtTokenAuthenticationProcessingFilter .
The question is that :
There are two Provider（AjaxAuthenticationProvider and JwtAuthenticationProvide）. When I enter AjaxLoginProcessingFilter it always choose ajaxAuthenticationProvider. When I enter JwtTokenAuthenticationProcessingFilter it always choose jwtAuthenticationProvider. Why? How it always choose the right Provider???

[Mr. Black Tea]

Oh,I think I found the answer. Is that depends on method 'supports' in the 'Provider'???