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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: trueurl: http://demo.com.cn/ 復制代碼

這里的stripPrefix默認為true，也就是所有/demo/xxxx的請求轉發給http://demo.com.cn/xxxx ,去除掉demo前綴

使用spring cloud gateway的配置

spring:cloud:gateway:default-filters:- AddResponseHeader=X-Response-Default-Foo, Default-Barroutes:- id: demouri: http://demo.com.cn:80order: 8999 ## 越小越優先predicates: - Path=/demo/**filters:- RewritePath=/demo/(?<segment>.*), /$\{segment} 復制代碼

spring cloud gateway貌似沒有現成的stripPrefix的配置，不過可以通過rewritepath來實現

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";@Overridepublic List<String> argNames() {return Arrays.asList(REGEXP_KEY, REPLACEMENT_KEY);}@Overridepublic 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());};} } 復制代碼

主要是這段String newPath = path.replaceAll(regex, replacement)，這里相當于regex是/demo/(?<segment>.*)，replacement是/${segment}

小結

spring cloud gateway利用RewritePath可以實現原來的zuul的stripPrefix的效果，而且功能更強大。

doc

• rewritepath_gatewayfilter_factory

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