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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 ,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}
    

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
    
      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。

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