public String requestFileString(final String url, final Map<String, ?> form, final Map<String, String> header,
        final List<UploadFile> files) throws IOException {
        return requestFile(url, form, header, files).body().string();
    }
requestFileString.

@param url    url
@param form   form
@param header header
@param files  files
@return String
@throws IOException IOException
shenyu-admin/src/main/java/org/apache/shenyu/admin/utils/HttpUtils.java