代理设置不适用于 Spring WebClient

Question

我的以下 WebClient 可以正常使用 Internet 连接，但不能通过我们的代理连接。

WebClient webClient = WebClient.builder()
        .baseUrl("https://targetsite.com")
        .build();

webClient.post()
    .uri("/service/serviceName")
    .body(BodyInserters.fromObject(reqData))
    .retrieve()
    .bodyToMono(WebServiceResponse.class)

事件虽然，同一个客户端通过代理工作，如果我如下设置它，

HttpClient httpClient = HttpClient.create()
            .tcpConfiguration(tcpClient -> tcpClient
                .proxy(proxy -> proxy
                    .type(ProxyProvider.Proxy.HTTP)
                    .host("ourproxy.com")
                    .port(8080)));

ReactorClientHttpConnector connector = new ReactorClientHttpConnector(httpClient);

WebClient webClient = WebClient.builder()
        .clientConnector(connector)
        .baseUrl("https://targetsite.com")
        .build();

webClient.post()
    .uri("/service/serviceName")
    .body(BodyInserters.fromObject(reqData))
    .retrieve()
    .bodyToMono(WebServiceResponse.class)

但是，如果我使用System.setProperty("http.proxyHost","ourproxy.com"); System.setProperty("http.proxyPort","8080"); 或 JVM 运行时参数设置相同的代理详细信息-Dhttp.proxyHost=ourproxy.com -Dhttp.proxyPort=8080

WebClient webClient = WebClient.builder()
        .baseUrl("https://targetsite.com")
        .build();

System.setProperty("http.proxyHost", "ourproxy.com");
System.setProperty("http.proxyPort", "8080");

webClient.post()
    .uri("/service/serviceName")
    .body(BodyInserters.fromObject(reqData))
    .retrieve()
    .bodyToMono(WebServiceResponse.class)

调用因 UnknownHostException 而失败，例如，

[04/11/2019 12:32:43.031 IST] DEBUG [reactor-http-epoll-3] [PooledConnectionProvider:254] - Creating new client pool [http] for targetsite.com:443
[04/11/2019 12:32:43.033 IST] DEBUG [reactor-http-epoll-3] [PooledConnectionProvider:254] - [id: 0xe4a0dc15] Created new pooled channel, now 0 active connections and 1 inactive connections
[04/11/2019 12:32:43.045 IST] DEBUG [reactor-http-epoll-3] [SslProvider:254] - [id: 0xe4a0dc15] SSL enabled using engine SSLEngineImpl and SNI targetsite.com:443
[04/11/2019 12:32:43.046 IST] DEBUG [reactor-http-epoll-3] [BootstrapHandlers:254] - [id: 0xe4a0dc15] Initialized pipeline DefaultChannelPipeline{(reactor.left.sslHandler = io.netty.handler.ssl.SslHandler), (reactor.left.sslReader = reactor.netty.tcp.SslProvider$SslReadHandler), (BootstrapHandlers$BootstrapInitializerHandler#0 = reactor.netty.channel.BootstrapHandlers$BootstrapInitializerHandler), (SimpleChannelPool$1#0 = io.netty.channel.pool.SimpleChannelPool$1), (reactor.left.httpCodec = io.netty.handler.codec.http.HttpClientCodec), (reactor.left.decompressor = io.netty.handler.codec.http.HttpContentDecompressor), (reactor.right.reactiveBridge = reactor.netty.channel.ChannelOperationsHandler)}
[04/11/2019 12:32:43.165 IST] ERROR [reactor-http-epoll-2] [AbstractErrorWebExceptionHandler:117] - [13ebf1eb] 500 Server Error for HTTP POST "/service/serviceName"
java.net.UnknownHostException: targetsite.com: Name or service not known

请帮助，如果我通过 JVM 运行时参数或系统属性设置代理详细信息，为什么我的代码不起作用。

其实我想避免代码级代理设置。所以请指导我更正我的代码或方法，以便我可以使用 JVM 运行时参数选项。

Answer 1

后来当我向 reactor-netty 团队（https://github.com/reactor/reactor-netty/issues/887#issuecomment-549439355）提出这个问题时，他们证实，reactor不支持系统属性。 netty.http.client.HttpClient。唯一的选择是通过tcpConfiguration设置它，我已经在我的问题中提到过；所以我用这个评论结束这个问题。

谢谢你们

Answer 2

我没有足够的声誉来评论其他答案，所以我必须在这里开始我自己的答案。

从reactor-netty v1.0.8开始，可以从系统属性配置代理。

例子：

WebClient
    .builder()
    .clientConnector(
        new ReactorClientHttpConnector(
            HttpClient.create().proxyWithSystemProperties()))
.build()

Answer 3

您需要在创建 HttpClient 实例时设置代理主机和端口，如下所示。

HttpClient httpClient =
            HttpClient.create()
                    .proxy(proxy -> proxy.type(ProxyProvider.Proxy.HTTP)
                            .host(sasConfig.getProxyHost())
                            .port(Integer.parseInt(sasConfig.getProxyPort())));

ReactorClientHttpConnector conn = new ReactorClientHttpConnector(httpClient);

WebClient webClient = WebClient.builder().clientConnector(conn).build();