XML specified is not syntactically valid error while putting block blob list on azure storage using rest api

Question

I'm trying to put block blob list to azure storage, but I'm getting "XML specified is not syntactically valid" error. I'm using REST API in java.

XML:

<?xml version="1.0" encoding="utf-8"?>
<BlockList>
  <Latest>AA==</Latest>
  <Latest>AQ==</Latest>
  <Latest>Ag==</Latest>
  <Latest>Aw==</Latest>
  <Latest>BA==</Latest>
  <Latest>BQ==</Latest>
  <Latest>Bg==</Latest>
  <Latest>Bw==</Latest>
  <Latest>CA==</Latest>
  <Latest>CQ==</Latest>
  <Latest>Cg==</Latest>
  <Latest>Cw==</Latest>
  <Latest>DA==</Latest>
  <Latest>DQ==</Latest>
  <Latest>Dg==</Latest>
  <Latest>Dw==</Latest>
  <Latest>EA==</Latest>
  <Latest>EQ==</Latest>
  <Latest>Eg==</Latest>
  <Latest>Ew==</Latest>
  <Latest>FA==</Latest>
  <Latest>FQ==</Latest>
  <Latest>Fg==</Latest>
  <Latest>Fw==</Latest>
  <Latest>GA==</Latest>
  <Latest>GQ==</Latest>
  <Latest>Gg==</Latest>
</BlockList>

I'm sending it using HttpRequest.put(url).send(...)

Any ideas what could be a problem here?

Update: There are no errors when putting block list without any block:

<?xml version="1.0" encoding="utf-8"?>
<BlockList>
</BlockList>

Answer 1

I was having the same problem implementing straight against the REST API without a library. The default API version (unless you specify an alternate) doesn't support this xml schema for multipart uploads. Switching to x-ms-version: 2011-08-18 fixed the problem for me.