请问下，这样的代码如何写在代码中，功能是想用html提交一些图片或xml数据上去，
Content-Type: multipart/form-data; boundary=43706cbec49f4b73a2221b6da7c85140
Authorization: Bearer ...
Content-Length: 7802
Expect: 100-continue
--43706cbec49f4b73a2221b6da7c85140
Content-Type: text/html
Content-Dis-data; name=presentation
<html>
<head>
<title>Page with xml</title>
</head>
</html>
--43706cbec49f4b73a2221b6da7c85140
Content-Type: application/xml
Content-Dis-data; name=presentation-xml
<xml>
.........
</xml>
