@Configuration
public class FeignConfig implements RequestInterceptor {
    @Autowired
    private ObjectFactory<HttpMessageConverters> messageConverters;

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

    @Bean
    public Decoder feignDecoder() {
        return new ResponseEntityDecoder(new SpringDecoder( () -> {
            FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter() {
                @Override
                public Object read(Type type, Class<?> contextClass, HttpInputMessage inputMessage) throws IOException, HttpMessageNotReadableException {
                    Object result=null;
                    if ("java.lang.String".equals(type.getTypeName())) {
                        result= StreamUtils.copyToString(inputMessage.getBody(), Charset.forName("utf8"));
                    } else {
                        result=super.read(type, contextClass, inputMessage);
                    }
                    return result;
                }
            };
            return new HttpMessageConverters(fastConverter);
        }));
    }

    @Override
    public void apply(RequestTemplate requestTemplate) {
        try {
            ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder
                    .getRequestAttributes();
            if (null != servletRequestAttributes) {
                HttpServletRequest request = servletRequestAttributes.getRequest();
                // 获取所有头文件信息的key
                Enumeration<String> headerNames = request.getHeaderNames();
                if (null != headerNames) {
                    while (headerNames.hasMoreElements()) {
                        // 获取头文件的key和value
                        String headerName = headerNames.nextElement();
                        String headerValue = request.getHeader(headerName);
                        // 跳过content-length，不然可能会报too many bites written问题
                        if ("content-length".equalsIgnoreCase(headerName)) {
                            continue;
                        }
                        // 将令牌数据添加到头文件中，当用feign调用的时候，会传递给下一个微服务
                        requestTemplate.header(headerName, headerValue);
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Bean
    public Logger.Level feignLoggerLevel() {
        return Logger.Level.FULL;
    }

}

feign.codec.DecodeException: Error while extracting response for type [com.entity.Result<com.baomidou.mybatisplus.extension.plugins.pagination.Page<com.emergency.pojo.HcUser>>] and content type [application/json]; nested exception is org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: syntax error, expect {, actual [, pos 685, fieldName roles, fastjson-version 1.2.83; nested exception is com.alibaba.fastjson.JSONException: syntax error, expect {, actual [, pos 685, fieldName roles, fastjson-version 1.2.83