HttpClient提供了很多接口，让我们能自定义处理逻辑，这些接口可以在AbstractHttpClient中找到：

setAuthSchemes(AuthSchemeRegistry);

setConnectionBackoffStrategy(ConnectionBackoffStrategy);

setReuseStrategy(ConnectionReuseStrategy);

setKeepAliveStrategy(ConnectionKeepAliveStrategy);

setHttpRequestRetryHandler(HttpRequestRetryHandler);

setRedirectHandler(RedirectHandler);

setRedirectStrategy(RedirectStrategy);

setTargetAuthenticationHandler(AuthenticationHandler);

setTargetAuthenticationStrategy(AuthenticationStrategy);

setProxyAuthenticationHandler(AuthenticationHandler);

setProxyAuthenticationStrategy(AuthenticationStrategy);

setUserTokenHandler(UserTokenHandler);