序

zuul的SimpleHostRoutingFilter主要用来转发不走eureka的proxy，里头是使用httpclient来转发请求的，但是有时候我们需要改动相关httpclient的配置，这个时候，就需要修改SimpleHostRoutingFilter了，这里讲一下如何扩展SimpleHostRoutingFilter。

自定义SimpleHostRoutingFilter

比如把httpclient的CookieSpec设置为default，比如把SSLContext升级为TLSv1.2

public class CustomHostRoutingFilter extends SimpleHostRoutingFilter{

private static final Logger LOGGER = LoggerFactory.getLogger(CustomHostRoutingFilter.class);

@Value("${zuul.host.socket-timeout-millis}")

int SOCKET_TIMEOUT;

@Value("${zuul.host.connect-timeout-millis}")

int CONNECTION_TIMEOUT;

private ZuulProperties.Host hostProperties;

private boolean sslHostnameValidationEnabled;

private PoolingHttpClientConnectionManager connectionManager;

public CustomHostRoutingFilter(ProxyRequestHelper helper, ZuulProperties properties) {

super(helper, properties);

this.sslHostnameValidationEnabled = properties.isSslHostnameValidationEnabled();

this.hostProperties = properties.getHost();

LOGGER.error("CustomHostRoutingFilter init");

}

@Override

protected CloseableHttpClient newClient() {

final RequestConfig requestConfig = RequestConfig.custom()

.setSocketTimeout(SOCKET_TIMEOUT)

.setConnectTimeout(CONNECTION_TIMEOUT)

// 这里改为default

.setCookieSpec(CookieSpecs.DEFAULT).build();

HttpClientBuilder httpClientBuilder = HttpClients.custom();

if (!this.sslHostnameValidationEnabled) {

httpClientBuilder.setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE);

}

return httpClientBuilder.setConnectionManager(newConnectionManager())

.disableContentCompression()

.useSystemProperties().setDefaultRequestConfig(requestConfig)

.setRetryHandler(new DefaultHttpRequestRetryHandler(0, false))

.setRedirectStrategy(new RedirectStrategy() {

@Override

public boolean isRedirected(HttpRequest request,

HttpResponse response, HttpContext context)

throws ProtocolException {

return false;

}

@Override

public HttpUriRequest getRedirect(HttpRequest request,

HttpResponse response, HttpContext context)

throws ProtocolException {

return null;

}

}).build();

}

@Override

protected PoolingHttpClientConnectionManager newConnectionManager() {

try {

// 这里改为TLS

final SSLContext sslContext = SSLContext.getInstance("TLSv1.2");

sslContext.init(null, new TrustManager[] { new X509TrustManager() {

@Override

public void checkClientTrusted(X509Certificate[] x509Certificates,

String s) throws CertificateException {

}

@Override

public void checkServerTrusted(X509Certificate[] x509Certificates,

String s) throws CertificateException {

}

@Override

public X509Certificate[] getAcceptedIssuers() {

return null;

}

} }, new SecureRandom());

RegistryBuilder registryBuilder = RegistryBuilder

. create()

.register(HTTP_SCHEME, PlainConnectionSocketFactory.INSTANCE);

if (this.sslHostnameValidationEnabled) {

registryBuilder.register(HTTPS_SCHEME,

new SSLConnectionSocketFactory(sslContext));

}

else {

registryBuilder.register(HTTPS_SCHEME, new SSLConnectionSocketFactory(

sslContext, NoopHostnameVerifier.INSTANCE));

}

final Registry registry = registryBuilder.build();

this.connectionManager = new PoolingHttpClientConnectionManager(registry, null, null, null,

hostProperties.getTimeToLive(), hostProperties.getTimeUnit());

this.connectionManager

.setMaxTotal(this.hostProperties.getMaxTotalConnections());

this.connectionManager.setDefaultMaxPerRoute(

this.hostProperties.getMaxPerRouteConnections());

return this.connectionManager;

}

catch (Exception ex) {

throw new RuntimeException(ex);

}

}

}

配置自定义的filter

@Configuration

@EnableZuulProxy

public class CustomZuulProxyConfig extends ZuulProxyConfiguration{

@Bean

@Override

public SimpleHostRoutingFilter simpleHostRoutingFilter(ProxyRequestHelper helper,

ZuulProperties zuulProperties) {

return new CustomHostRoutingFilter(helper, zuulProperties);

}

}

这样就大功告成了

doc