WebFlux application server add server.forward- Headers - Strategy = Framework RouterFunction endpoint 404

There are two services:

account-service, gateway-server

After the account-service has set the ‘server.forward- Headers - Strategy = Framework’ property.routerFunction endpoint start 404

The following interfaces are accessed through the Spring Cloud Gateway

http://localhost:8080/account/hi is 404. The generated by RouterFunction endpoint

http://localhost:8080/account/hello return 200 normal, through RequestMapping annotations

Reproducible Example：

forward-proxy-demo.zip

[poutsma]

This is something that needs to be straightened out in WebFlux.fn. I will pick it up for 5.3, since it will be a breaking change for some people.

[bclozel]

Now that #25279 is solved, I’ve checked again with the sample application.

There is a major mapping difference between Spring WebFlux annotations and RouterFunctions mapping:

• Annotations remove the context path when mapping, by using the org.springframework.http.server.RequestPath#pathWithinApplication
• RouterFunction variants always use the full path since org.springframework.web.reactive.function.server.ServerRequest#pathContainer is returning a PathContainer, and not RequestPath (which extends PathContainer). The context path is not removed before mapping.

Debugging through sample applications show that the DefaultServerRequest implementation is using the underlying RequestPath, it’s just not exposing it as is.

@poutsma @rstoyanchev this difference is the only remaining point here; I can see why RouterFunctions could be considered more explicit, and maybe nesting routes should be used instead here in applications. We’re not calling out that difference anywhere in our documentation as far as I understand, maybe because contextPath shouldn’t even be a concept in the functional variant?

I managed to reproduce this with a new test in RequestPredicatesTests:

@Test
public void pathWithContext() {
	URI uri = URI.create("https://localhost/context/path");
	RequestPredicate predicate = RequestPredicates.path("/p*");
	MockServerHttpRequest mockRequest = MockServerHttpRequest.get(uri.toString()).contextPath("/context").build();
	ServerRequest request = new DefaultServerRequest(MockServerWebExchange.from(mockRequest), emptyList());
	assertThat(predicate.test(request)).isTrue();

	mockRequest = MockServerHttpRequest.head("https://example.com").build();
	request = new DefaultServerRequest(MockServerWebExchange.from(mockRequest), Collections.emptyList());
	assertThat(predicate.test(request)).isFalse();
}