企业网络下使用WebClient代理时如何解决UnresolvedAddressException？

问题根源 #

你代码里的错误出在代理地址的配置上：InetSocketAddress.createUnresolved("http://mycorporate.proxy.com", 8080) 中给主机名加了http://前缀，而InetSocketAddress只需要纯主机名（不含协议），带前缀会导致系统无法正确解析代理服务器的地址，从而抛出UnresolvedAddressException。

修正后的代码 #

@Bean
public WebClient restClient() {
    HttpClient httpClient = HttpClient.create()
            .proxy(proxy -> proxy.type(ProxyProvider.Proxy.HTTP)
                    .address(InetSocketAddress.createUnresolved("mycorporate.proxy.com", 8080)));

    ReactorClientHttpConnector connector = new ReactorClientHttpConnector(httpClient);

    return WebClient
            .builder()
            .clientConnector(connector)
            .build();
}

额外排查点 #

• 确认代理主机名和端口是否和企业网络配置一致，避免拼写错误
• 如果企业代理需要用户名密码认证，需要补充认证配置：

  .proxy(proxy -> proxy.type(ProxyProvider.Proxy.HTTP)
          .address(InetSocketAddress.createUnresolved("mycorporate.proxy.com", 8080))
          .username("your-proxy-username")
          .password(() -> "your-proxy-password".toCharArray()))
  

• 测试代理地址是否可以正常访问，比如用ping mycorporate.proxy.com或者telnet mycorporate.proxy.com 8080验证连通性

内容的提问来源于stack exchange，提问作者IceBane