java - 使用 Spring Webflux 的 HTTP 201 的绝对位置 header

Question

我有一个响应式(Reactive) REST Controller (使用 Spring WebFlux)，在执行 POST 请求时，我想设置一个指向刚创建的资源的绝对链接进入强制性 Location header 。到目前为止，我只能创建相对 链接。以任意顺序添加 org.springframework.http.server.reactive.ServerHttpRequest 或 org.springframework.web.server.ServerWebExchange 作为附加方法参数检索主机信息等导致未到达 Controller 方法的 HTTP 415 响应。

@RequestMapping("/v1/stuffs")
@RestController
public class StuffController {

    @PostMapping
    public Mono<ResponseEntity<Stuff>> createStuff(
            @Valid @NotNull @RequestBody Mono<Stuff> stuff) {
        UUID id = UUID.randomUUID();

        URI uri = UriComponentsBuilder.newInstance().pathSegment("v1", "stuffs", id.toString()).build().toUri();

        // ugly approach with help of spring-hateoas, which resulted in a relative link too
        // URI uri = WebFluxLinkBuilder.linkTo(WebFluxLinkBuilder.methodOn(StuffController.class).getStuff(id)).withSelfRel().toMono().block().toUri();

        return stuff
            .map(it -> stuffService.create(id, it))
            .map(it -> ResponseEntity.created(uri).build());
    }

    @GetMapping("/{id}")
    public Mono<ResponseEntity<Stuff>> getStuff(@NotNull @PathVariable("id") UUID id) {
        // ...
    }

}

Answer 1

将 UriComponentsBuilder componentsBuilder 添加到 Controller 的方法签名应该可以使其工作:

@PostMapping
public Mono<ResponseEntity<Stuff>> createStuff(
    @Valid @NotNull @RequestBody Mono<Stuff> stuff,
    UriComponentsBuilder componentsBuilder) {
    ...
    URI uri = componentsBuilder.path("/v1/stuffs/{id}").buildAndExpand(id.toString()).toUri();
    ...
}