解决使用RestTemplate时报错RestClientException的问题

public  Map<String, Object> sendRequest(Map<String, Object> body,String sessionId,String url) {
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(new BdMappingJackson2HttpMessageConverter());
        Map<String, Object> map = new HashMap<>();
        try {
            ParameterizedTypeReference<Map<String, Object>> typeRef = new ParameterizedTypeReference<Map<String, Object>>() {
            };
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            headers.set("cookie", "SESSION="+sessionId);
            HttpEntity<Map<String, Object>> requestEntity = new HttpEntity<>(body,headers);
            ResponseEntity<Map<String, Object>> responseEntity = restTemplate.exchange(url, HttpMethod.POST,
                    requestEntity,typeRef);
            map = responseEntity.getBody();
            log.info(map.toString());
        } catch (HttpStatusCodeException e) {
            log.error(e.getResponseBodyAsString(), e);
            map = JsonUtil.toMap(e.getResponseBodyAsString());
        }
        return map;
    }

public class BdMappingJackson2HttpMessageConverter extends MappingJackson2HttpMessageConverter {
    public BdMappingJackson2HttpMessageConverter(){
        List<MediaType> mediaTypes = new ArrayList<>();
        mediaTypes.add(MediaType.TEXT_HTML);
        mediaTypes.add(MediaType.APPLICATION_OCTET_STREAM);
        setSupportedMediaTypes(mediaTypes);
    }
}

public interface ResponseErrorHandler {
    boolean hasError(ClientHttpResponse var1) throws IOException;
    void handleError(ClientHttpResponse var1) throws IOException;
}

protected boolean hasError(HttpStatus statusCode) {
        return statusCode.series() == Series.CLIENT_ERROR || statusCode.series() == Series.SERVER_ERROR;
    }

public void handleError(ClientHttpResponse response) throws IOException {
        HttpStatus statusCode = this.getHttpStatusCode(response);
        switch(null.$SwitchMap$org$springframework$http$HttpStatus$Series[statusCode.series().ordinal()]) {
        case 1:
            throw new HttpClientErrorException(statusCode, response.getStatusText(), response.getHeaders(), this.getResponseBody(response), this.getCharset(response));
        case 2:
            throw new HttpServerErrorException(statusCode, response.getStatusText(), response.getHeaders(), this.getResponseBody(response), this.getCharset(response));
        default:
            throw new RestClientException("Unknown status code [" + statusCode + "]");
        }
    }