Spring Boot style edition in Geoserver by Rest Api

Could You please help me to edit styles in geoserver by POST method? I am in trouble with this and I am stuck in one place. When I run this code and go to http://localhost:8010/styles/point on the page and I have Whitelabel error and in postman I have an error 400 Bad Request

public class StyleRequest {
    private String fill = "#042041";
    private String stroke = "#040001";

    public String getFill() {
        return fill;
    }

    public void setFill(String fill) {
        this.fill = fill;
    }

    public String getStroke() {
        return stroke;
    }

    public void setStroke(String stroke) {
        this.stroke = stroke;
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/styles")
public class StyleController {

    private GeoServerStyleService styleService;

    @Autowired
    public StyleController(GeoServerStyleService styleService) {
        this.styleService = styleService;
    }

    @PostMapping("/{name}")
    public ResponseEntity<Void> editStyle(@PathVariable String name, @RequestBody StyleRequest styleRequest) {
        styleService.editStyle(name, styleRequest.getFill(), styleRequest.getStroke());
        return ResponseEntity.ok().build();
    }
}

import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Service;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.client.WebClient;

@Service
public class GeoServerStyleService {

    private WebClient webClient;

    public GeoServerStyleService() {
        this.webClient = WebClient.builder()
                .baseUrl("http://localhost:8080/geoserver/rest/")
                .defaultHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_XML_VALUE)
                .build();
    }

    public void editStyle(String styleName, String fill, String stroke) {
        String styleXml = "<NamedLayer>\n" +
                "    <Name>" + styleName + "</Name>\n" +
                "    <UserStyle>\n" +
                "      <Title>A dark yellow polygon style</Title>\n" +
                "      <FeatureTypeStyle>\n" +
                "        <Rule>\n" +
                "          <Title>dark yellow polygon</Title>\n" +
                "          <PolygonSymbolizer>\n" +
                "            <Fill>\n" +
                "              <CssParameter name=\"fill\">" + fill + "</CssParameter>\n" +
                "            </Fill>\n" +
                "            <Stroke>\n" +
                "              <CssParameter name=\"stroke\">" + stroke + "</CssParameter>\n" +
                "              <CssParameter name=\"stroke-width\">0.5</CssParameter>\n" +
                "            </Stroke>\n" +
                "          </PolygonSymbolizer>\n" +
                "        </Rule>\n" +
                "      </FeatureTypeStyle>\n" +
                "    </UserStyle>\n" +
                "  </NamedLayer>";

        webClient.post()
                .uri("styles/" + styleName + ".xml")
                .body(BodyInserters.fromValue(styleXml))
                .retrieve()
                .toBodilessEntity()
                .block();
    }
}

I tried run code on http://localhost:8010/styles/point on the page and I have Whitelabel error and in postman I have an error 400 Bad Request. I don`t know what I can try

There are two steps to creating a new style via the REST API,

> You can create a new style on the server in two ways. In the first way, the creation is done in two steps: the style entry is created in the catalog, and then the style content is uploaded

So you need to do a POST to http://localhost:8080/geoserver/rest/styles
with a body of:

<style><name>roads_style</name><filename>roads.sld</filename></style>

to create the style entry, and then a PUT to http://localhost:8080/geoserver/rest/styles/roads_style - where the last element matches the name in the body above, with a content-type of application/vnd.ogc.sld+xml and a body containing the actual SLD (XML). If you want to change the style then you just repeat this step with the new SLD file.

See the manual for examples

Is it something like this?

@Component
public class GeoServerClient {

RestTemplate rest;
String url;

@Autowired
public GeoServerClient(RestTemplate rest, @Value("${geo.url}") String url) {
this.rest= rest;
this.url= url;
}

public void createNewStyle() {
String createStyleUrl = geoserverUrl + "/rest/styles";
String xmlBody = "<style><name>roads_style</name><filename>roads.sld</filename>                    
</style>";

HttpHeaders head= new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_XML);

HttpEntity<String> request= new HttpEntity<>(xmlBody, headers);
}
}