Comment 6 for bug 1352256

Looks like this bug is still valid.

I've tracked handling of upload request and found out that there is no place where Horizon passes length header into the swift client. `put_object` method from swift API supports `content_length ` param and Horizon calculates size of the file in the `put_object` method. So we can use this 'size' and pass it as a param into 'put_object'.