我的项目里面有个feign拦截器，将content_type的值改变了，只需要保留原content_type
加上 if (“content-type”.equalsIgnoreCase(name)) {
continue;
}即可

public class FeignRequestInterceptor implements RequestInterceptor {
    @Override
    public void apply(RequestTemplate template) {
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
        if (requestAttributes == null) {
            return;
        }
        HttpServletRequest request = ((ServletRequestAttributes) requestAttributes).getRequest();
        Enumeration<String> headerNames = request.getHeaderNames();
        if (headerNames != null) {
            while (headerNames.hasMoreElements()) {
                String name = headerNames.nextElement();
                Enumeration<String> values = request.getHeaders(name);
                while (values.hasMoreElements()) {
                    String value = values.nextElement();
                    if ("content-type".equalsIgnoreCase(name)) {
                        continue;
                    }
                    template.header(name, value);
                }
            }
        }
    }
}