Spring WebClient automatically adding value to url

I'm new in spring.

I'm trying to get data from youtube's api using webclient

My service layer look like this

@Servicepublic class YoutubeService implements YTB {private WebClient webClient;private final String API_KEY="";public YoutubeService() {    webClient=WebClient.create("https://youtube.googleapis.com/youtube/v3/");}public YoutubeService(WebClient webClient) {    this.webClient = webClient;}public List<youtubeData> getData(String id){    return webClient.get()            .uri("/videos?part=snippet%2Cstatistics&id="+id+"&key="+API_KEY)            .retrieve()            .bodyToFlux(youtubeData.class)            .collectList()            .block();}}

And my controller:

@RestController@RequestMapping("/ytbapi")public class ytbController {@Autowiredprivate YTB service;@GetMapping("/getData/{id}")public List<youtubeData> show(@PathVariable String id){    return service.getData(id);}}

It work fine when I set

uri("/videos?part=snippet&id="+id+"&key="+API_KEY")

But when I change it to like above and run, I got HTTP Status 500

Request processing failed; nested exception is org.springframework.web.reactive.function.client.WebClientResponseException$BadRequest:400 Bad Request from GEThttps://youtube.googleapis.com/youtube/v3/videos?part=snippet%252Cstatistics&id=r9LqfLM93Hw&key=AIzaSyDpPf8w8YN4O6KSiedVUwusiPhU-HP4Iek

The problem is something add 25 in this part: snippet%252Cstatistics

How should I fix it?