Allow "direct" or None in proxy_config list to explicitly try without a proxy before escalating to proxy servers. The retry loop already handled None as direct — this exposes it as a clean user-facing API via ProxyConfig.DIRECT.
Allow "direct" or None in proxy_config list to explicitly try without a proxy before escalating to proxy servers. The retry loop already handled None as direct — this exposes it as a clean user-facing API via ProxyConfig.DIRECT.