Spring Cloud API Gateway Passing Dynamic Parameter value - spring

Question

I'm learning how to build an API Gateway using Spring Cloud. I've scoured through the documentation on how to pass a parameter and all examples seem to show them as hardcoded in. But what if I have a dynamic value?
For example I have this type of request: http://localhost:8080/people/lookup?searchKey=jdoe,
How do I pass in the "jdoe" part?
I tried the following code and it works only if I hardcode the value in the code.
i.e., .filters(f -> f.addRequestParameter("searchKey", "jdoe") .
That test also proves that my discovery server (Eureka) is working.
I'm not sure how to access the value using the provided builder methods. It's such a simple scenario but I'm surprised to find out there's not a lot of example or documentation for it so it must be just me.
#SpringBootApplication
#EnableEurekaClient
public class ApiGatewayApplication {
public static void main(String[] args) {
SpringApplication.run(ApiGatewayApplication.class, args);
}
#Bean
public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
return builder.routes()
.route("people-service", r -> r.path("/people/active-associates")
.uri("lb://people-service"))
.route(r -> r.path("/people/lookup")
.filters(f -> f.addRequestParameter("searchKey", howDoIPassDynamicValueHere))
.uri("lb://people-service")
.id("addrequestparameter_route"))
.build();
}
This obviously worked when I call the service directly because my microservice controller handles it like this using the #RequestParam...pretty straightforward:
#RestController
#RequestMapping(value = "/people")
public class PersonController {
#Autowired
private PersonService personService;
/**
* Searches by FirstName, Lastname or NetworkId.
*
* #param searchKey
* #return ResponseEntity<List<Person>>
*/
#GetMapping(value = "/lookup")
public ResponseEntity<List<Person>> findPersonsBySearchKey(#RequestParam(name = "searchKey") String searchKey) {
List<Person> people = personService.findActivePersonsByFirstLastNetworkId(searchKey.trim().toLowerCase());
return new ResponseEntity<List<Person>>(people, HttpStatus.OK);
}
}

Answer 1

Thanks to the comments, it started making sense to me. I guess I did overthink when I read the documentation about the filter's addRequestParameter() method. I thought that I would need to use that method if my requests have parameters. Been scratching my head for a day and I can't believe it's that simple. So I got it working by just removing that filter:
#SpringBootApplication
#EnableEurekaClient
public class ApiGatewayApplication {
public static void main(String[] args) {
SpringApplication.run(ApiGatewayApplication.class, args);
}
#Bean
public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
return builder.routes()
.route("people-service", r -> r.path("/people/active-associates")
.uri("lb://people-service"))
.route(r -> r.path("/people/lookup")
.uri("lb://people-service"))
.build();
}
}