jHipster gateway downstream prefix - jhipster

Question

I'm updating old jHipster gateway to 7.5.0 version. New version uses Spring Cloud Gateway (with Eureka), while the old one used Zuul. In previous version working with Service Discovery having service named 'foo' and path 'bar' would register it without any prefix on the gateway so it could be accessed as:
GATEWAY_URL/foo/bar
right now all services register with 'services/' prefix which results requires to call following url:
GATEWAY_URL/services/foo/bar
I can't find configuration responsible for that. I found a property spring.webservices.path, but changing this to other value does not make any change and in Spring Boot 2.6.3 its value cannot be empty or '/' (but Im not sure if this is a property I should be checking). I also experimented with spring.cloud.gateway.routes in form:
spring:
webservices:
path: /test
main:
allow-bean-definition-overriding: true
cloud:
gateway:
discovery:
locator:
enabled: true
routes:
- id: user-service-route
uri: lb://user
predicates:
- Path=/user/**
but without any luck. Also Im not sure if this is jHipster issue or SCG
I need to change that so that other systems using my API won't need to update their paths, I know I can always add nginx before so that it will rewrite te path but that feels not correct.

Answer 1

This behavior is done by SCG autoconfiguration - GatewayDiscoveryClientAutoConfiguration, it registers DiscoveryLocatorProperties bean with predicate:
PredicateDefinition{name='Path', args={pattern='/'+serviceId+'/**'}}
I didnt want to change autoconfigration, so I did WebFilter that is executed as first one and mutates request path
public class ServicesFilter implements WebFilter {
private final ServicesMappingConfigration mapping;
public ServicesFilter(ServicesMappingConfigration mapping) {
this.mapping = mapping;
}
#Override
public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
RequestPath path = exchange.getRequest().getPath();
if (path.elements().size() > 1) {
PathContainer pathContainer = path.subPath(1, 2);
if (mapping.getServices().contains(pathContainer.value())) {
ServerHttpRequest mutatedRequest = exchange
.getRequest()
.mutate()
.path("/services" + exchange.getRequest().getPath())
.build();
ServerWebExchange mutatedExchange = exchange.mutate().request(mutatedRequest).build();
return chain.filter(mutatedExchange);
}
}
return chain.filter(exchange);
}}