我想保存一个附件文件，该附件使用肥皂响应分多部分发送
Content-Type: application/xop+xml; charset=utf-8; type="text/xml"
Content-Transfer-Encoding: binary
Content-ID: <0.82ec94b3085b6df44d76195cb56f29f0dfd12706fde4a48f@apache.org>
<?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><getResponse xmlns:a="http://www.w3.org/2005/05/xmlmime" xmlns="http://org/emedny/fts/"><output><fileData><xop:Include xmlns:xop="http://www.w3.org/2004/08/xop/include" href="cid:92ec94b3085b6df44d76195cb56f29f0dfd12706fde4a48f@apache.org"/></fileData></output></getResponse></soapenv:Body></soapenv:Envelope>
--MIMEBoundary_f2ec94b3085b6df44d76195cb56f29f0dfd12706fde4a48f
Content-Type: application/octet-stream
Content-Transfer-Encoding: binary
Content-ID: <92ec94b3085b6df44d76195cb56f29f0dfd12706fde4a48f@apache.org>
//x12 file content here//
--MIMEBoundary_f2ec94b3085b6df44d76195cb56f29f0dfd12706fde4a48f-- ```
i want to extract the file content