Spring InvalidMediaTypeException:无效的mime类型“多部分/混合；boundary==_123456789"：令牌"=_123456789”中无效的令牌字符'=‘

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Spring InvalidMediaTypeException:无效的mime类型“多部分/混合；boundary==_123456789"：令牌"=_123456789”中无效的令牌字符'=‘

org.springframework.http.InvalidMediaTypeException: Invalid mime type "multipart/mixed; boundary==_11204303fda4403b6a72d61500081354": Invalid token character '=' in token "=_11204303fda4403b6a72d61500081354"
    at org.springframework.http.MediaType.parseMediaType(MediaType.java:620)
    at org.springframework.http.HttpHeaders.getContentType(HttpHeaders.java:992)
    at org.springframework.web.client.HttpMessageConverterExtractor.getContentType(HttpMessageConverterExtractor.java:136)
    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:93)
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:1037)
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:1020)
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:778)
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:711)
    at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.java:468)

multipart/mixed; boundary="=_11204303fda4403b6a72d61500081354"

public class MultipartMixedBoundaryRewritingInterceptor implements ClientHttpRequestInterceptor {
    private Pattern multipartMixedHeaderPattern = Pattern.compile("^multipart/mixed;\\s?boundary=(.*?)$");
    @Override
    public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
        ClientHttpResponse response = execution.execute(request, body);
        HttpHeaders responseHeaders = response.getHeaders();
        // Do not use .getHeaders().getContentType() since it checks everything and raises an exception on the invalid boundary
        String contentType = response.getHeaders().getFirst("Content-Type");
        Matcher matcher = multipartMixedHeaderPattern.matcher(contentType);
        if (contentType != null && matcher.matches()) {
            String boundaryParameter = matcher.group(1);
            try {
                responseHeaders.getContentType();
            } catch (IllegalArgumentException e) {
                if (boundaryParameter != null && !isQuotedString(boundaryParameter)) {
                    Map<String, String> parameters = new HashMap<>();
                    parameters.put("boundary", String.format("\"%s\"", boundaryParameter));
                    MediaType fixedContentType = new MediaType(MediaType.MULTIPART_MIXED, parameters);
                    response.getHeaders().setContentType(fixedContentType);
        return response;
    private boolean isQuotedString(String s) {
        return s.length() > 2 && ((s.startsWith("\"") && s.endsWith("\"")) || (s.startsWith("'") && s.endsWith("'")));
}

@Configuration
public class RestTemplateConfig {
    @Bean
    public RestTemplate restTemplate() {
        RestTemplate restTemplate = new RestTemplate();
        configureRestTemplateInterceptors(restTemplate);
        return restTemplate;
    private void configureRestTemplateInterceptors(RestTemplate restTemplate) {
        List<ClientHttpRequestInterceptor> interceptors = restTemplate.getInterceptors();
        if (CollectionUtils.isEmpty(interceptors)) {

Spring InvalidMediaTypeException:无效的mime类型“多部分/混合；boundary==_123456789"：令牌"=_123456789”中无效的令牌字符'=‘

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