restTemplate

@Bean
public RestTemplate createRestTemplate() {
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.writeTimeout(10, TimeUnit.SECONDS)
.readTimeout(10, TimeUnit.SECONDS)
.connectTimeout(10, TimeUnit.SECONDS)
.build();
return new RestTemplate(new OkHttp3ClientHttpRequestFactory(okHttpClient));
}

https://*.com/questions/29417455/setting-request-header-content-type-to-json-in-spring-framework-resttemplate

https://*.com/questions/4526273/what-does-enctype-multipart-form-data-mean

https://www.baeldung.com/spring-rest-template-multipart-upload

org.springframework.web.client.HttpClientErrorException$BadRequest: 400 Bad Request

https://*.com/questions/38019212/org-springframework-web-client-httpclienterrorexception-400-bad-request

restTemplate的bug， 当post contentType是multipart/form-data

restTemplate有问题

 /*try {
            //header
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.MULTIPART_FORM_DATA);
            //body
            LinkedMultiValueMap<String, Object> body = new LinkedMultiValueMap<>();
            body.add("api_key", publicKey);
            body.add("api_secret", privateKey);
            body.add("image", Base64.decodeBase64(idCardPositive));
            // httpEntity
            HttpEntity<LinkedMultiValueMap<String, Object>> httpEntity = new HttpEntity<>(body, headers);
            String url = FaceUtils.getUrl(baseUrl, Constant.ocridCard);
            ResponseEntity<FaceOCRVerifyResp> entity = restTemplate.postForEntity(url, httpEntity, FaceOCRVerifyResp.class);
            if (entity.getBody() != null) {
                return entity.getBody();
            }
        } catch (RestClientException e) {
            e.printStackTrace();
        }
        return null;*/

        try {
            RequestBody requestBody = new MultipartBody.Builder()
                    .setType(MultipartBody.FORM)
                    .addFormDataPart("api_key", publicKey)
                    .addFormDataPart("api_secret", privateKey)
                    .addFormDataPart("image", "image.png",
                            RequestBody.create(okhttp3.MediaType.parse(MediaType.IMAGE_PNG_VALUE), Base64.decodeBase64(idCardPositive)))
                    .build();

            Request request = new Request.Builder()
                    .url(FaceUtils.getUrl(baseUrl, Constant.ocridCard))
                    .post(requestBody)
                    .build();

            Response response = okHttpClient.newCall(request).execute();
            String body = response.body().string();
            logger.info("face++ ocr body >>> {} ", body);

            //status code
            int code = response.code();

            if (response.isSuccessful()) {
                return JSON.parseObject(body, FaceOCRVerifyResp.class);
            }

        } catch (IOException e) {
            logger.error("face++ ocr exception >>> {}", e.getMessage());
        }