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本文主要研究下spring cloud gateway的stripPrefix配置

使用zuul的配置

zuul:

  routes:

    demo:

      sensitiveHeaders: Access-Control-Allow-Origin,Access-Control-Allow-Methods

      path: /demo/**

      stripPrefix: true

      url: http://demo.com.cn/

这里的stripPrefix默认为true，也就是所有/demo/xxxx的请求转发给http://demo.com.cn/xxxx ,去除掉demo前缀

使用spring cloud gateway的配置

spring:

  cloud:

    gateway:

      default-filters:

      - AddResponseHeader=X-Response-Default-Foo, Default-Bar

      routes:

      - id: demo

        uri: http://demo.com.cn:80

        order: 8999 ## 越小越优先

        predicates:

        - Path=/demo/**

        filters:

        - RewritePath=/demo/(?<segment>.*), /$\{segment}

spring cloud gateway貌似没有现成的stripPrefix的配置，不过可以通过rewritepath来实现

spring-cloud-gateway-core-2.0.0.M6-sources.jar!/org/springframework/cloud/gateway/filter/factory/RewritePathGatewayFilterFactory.java

public class RewritePathGatewayFilterFactory implements GatewayFilterFactory {

	public static final String REGEXP_KEY = "regexp";

	public static final String REPLACEMENT_KEY = "replacement";

	@Override

	public List<String> argNames() {

		return Arrays.asList(REGEXP_KEY, REPLACEMENT_KEY);

	}

	@Override

	public GatewayFilter apply(Tuple args) {

		final String regex = args.getString(REGEXP_KEY);

		String replacement = args.getString(REPLACEMENT_KEY).replace("$\\", "$");

		return apply(regex, replacement);

	}

	public GatewayFilter apply(String regex, String replacement) {

		return (exchange, chain) -> {

			ServerHttpRequest req = exchange.getRequest();

			addOriginalRequestUrl(exchange, req.getURI());

			String path = req.getURI().getPath();

			String newPath = path.replaceAll(regex, replacement);

			ServerHttpRequest request = mutate(req)

					.path(newPath)

					.build();

			exchange.getAttributes().put(GATEWAY_REQUEST_URL_ATTR, request.getURI());

			return chain.filter(exchange.mutate().request(request).build());

		};

	}

}

主要是这段String newPath = path.replaceAll(regex, replacement)，这里相当于regex是/demo/(?<segment>.*)，replacement是/${segment}

小结

spring cloud gateway利用RewritePath可以实现原来的zuul的stripPrefix的效果，而且功能更强大。