无法使用上下文路径将请求转发到 URI

Question

I am unable to forward my request to a URI with contextpath.

For example I am requesting my Spring cloud gateway server with

http://localhost:1010/mygateway/server/date

And I expect it to forward to

http://myapiserver.com/xyzapi/v1/server/date

But It gives me 404

@Bean
public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
    return builder.routes()
            .route("api-server-date", r -> r.host("**")
                    .and()
                    .path("/mygateway/server/date")
                    .filters(f -> f.stripPrefix(1))
                    .uri("https://myapiserver.com/xyzapi/v1"))
            .build();
}

It works when I change my configuration to this

@Bean
public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
    return builder.routes()
            .route("api-server-date", r -> r.host("**")
                    .and()
                    .path("/mygateway/xyzapi/v1/server/date")
                    .filters(f -> f.stripPrefix(1))
                    .uri("https://myapiserver.com"))
            .build();
}

I don't know what configuration I am providing wrong. It should work.

All I want is to use

https://myapiserver.com/xyzapi/v1

As my URI. Meaning all Incoming traffic to my spring cloud gateway server should forward to this URL after appending the incoming url

Kindly suggest what is wrong ? Or is it something not possible with Spring Cloud Gateway ?

Answer 1

I think what you want (looking at online samples) is:

@Bean
public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
  String requestHandlerUrl = "http://myapiserver.com/xyzapi/v1/server/date";
  return builder.routes()
          .route("api-server-date", r -> r.host("**")
             .and()
             .path("/mygateway/server/date")
             .filters(f -> f.stripPrefix(1))
             .uri(requestHandlerUrl)
          .build();
}

... so that requests made to whatever host your app is deployed on are forwarded/passed to requestHandlerUrl as the destination.

It looks as if /mygateway/server/date is the "shortcut" or alias for the URL you actually want to handle the request.

Some examples here: https://cloud.spring.io/spring-cloud-gateway/multi/multi__configuration.html#_fluent_java_routes_api