[bloggerDev] error publishing post on blogspot blog

hi ,
I am using php and curl to publish on blogspot but i am getting
Google Error
Length Required
POST requests require a Content-length header.

I am able to Get a Token , Able to exchange it with a Session token
and able to index list of blogs.
When i am trying to publish a post , i am using these details to post.

Predefined variables
$sessiontoken -this is a AuthSub session token , received after
exchanging with single-use AuthSub token.
$blogID - id of my blog.

$headers[0] ="Content-type: application/atom+xml";
$headers[1]="Authorization: AuthSub token=".$sessiontoken."";

And making a post on this url
http://www.blogger.com/feeds/' . $blogID . '/posts/default'

So what header do i need to include to make this work , not sure what
i am doing wrong as this was working fine , few months ago.

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