[FIXED] Spring WebClient automatically adding value to url

Issue

I'm new in spring.

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

My service layer look like this

@Service
public 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 {

@Autowired
private 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 GET https://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?

Solution

In your URI string "/videos?part=snippet%2Cstatistics&id="+id+"&key="+API_KEY you have a character "%" which has a so called reserved meaning.
uri(String uri, Object... uriVariables) method of UriSpec class uses DefaultUriBuilderFactory by default under the hood, which uses UriComponentsBuilder's encode() method by default. So, symbol "%" is encoded to "%25" in your URI.

You can check what symbols are encoded and to what here.

You used "%2C" in your URI, so I believe you meant "," there.
As URL-encoding is the default behavior of WebClient, you can define you uri path in unencoded way with a simple coma like this:

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

Answered By - AndrewThomas
Answer Checked By - Katrina (JavaFixing Volunteer)