ArticlesController.java

package com.baeldung.web;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.oauth2.client.OAuth2AuthorizedClient;
import org.springframework.security.oauth2.client.annotation.RegisteredOAuth2AuthorizedClient;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.reactive.function.client.WebClient;
import org.springframework.web.servlet.ModelAndView;

import static org.springframework.security.oauth2.client.web.reactive.function.client.ServerOAuth2AuthorizedClientExchangeFilterFunction.oauth2AuthorizedClient;

@RestController
public class ArticlesController {

    @Autowired
    private WebClient webClient;

    @GetMapping("/")
    public ModelAndView redirectWithUsingRedirectPrefix(ModelMap model) {
        return new ModelAndView("redirect:/articles", model);
    }

    @GetMapping(value = "/articles")
    public String[] getArticles(
      @RegisteredOAuth2AuthorizedClient("articles-client-authorization-code") OAuth2AuthorizedClient authorizedClient
    ) {
        return this.webClient
          .get()
          .uri("http://127.0.0.1:8090/articles")
          .attributes(oauth2AuthorizedClient(authorizedClient))
          .retrieve()
          .bodyToMono(String[].class)
          .block();
    }
}