Multipart uploads to non-AWS servers don't work

[cyberduck]

8824a7e created the issue

When using a non-AWS S3 server large files are not sent using the multipart upload API. This prevents it from working on files over 5 GB which are required to use multipart uploading.

Here are some details from my environment:

Cyberduck sends

PUT /redacted/alsoredacted.dat HTTP/1.1
Date: Tue, 17 Mar 2015 19:25:24 GMT
Expect: 100-continue
Content-Type: application/octet-stream
Authorization: AWS REDACTED
Content-Length: 8895594496
Host: myserver.com:80
Connection: Keep-Alive
User-Agent: Cyberduck/4.6.5 (17000) (Windows 7/6.1) (x86)

The Ceph/S3 server is returning

HTTP/1.1 400 Bad Request
Date: Tue, 17 Mar 2015 19:25:24 GMT
Server: Apache/2.2.22 (Fedora)
Accept-Ranges: bytes
Content-Length: 80
Connection: close
Content-Type: application/xml
 <?xml version="1.0" encoding="UTF-8"?><Error><Code>EntityTooLarge</Code></Error>

[cyberduck]

@dkocher commented

In faea226.