响应：{“httpcode”：“400”，“httpmessage”：“错误请求”，“moreinformation”：“api请求中缺少一个或多个必需的api参数。”}
从日志中，我可以看到所有参数的传递方式如下：grant\u type=client\u credentials&scope=ban&client\u id=sample&client\u secret=sample

@FeignClient(name = "tru", url = "${api.tru.url}", configuration = TruConfig.class)
public interface TruClient {
    @PostMapping(value = "/tru/oauth2/token", consumes = APPLICATION_FORM_URLENCODED_VALUE)
    AuthTokenResponse getAccessToken(@RequestBody MultiValueMap<String, ?> formParams);

     class FeignSupportConfig {

        @Autowired
        private ObjectFactory<HttpMessageConverters> messageConverters;

         @Bean
         public Encoder feignFormEncoder() {
             return new FormEncoder(new SpringEncoder(messageConverters));
         }
    }
}