Exchange 2000 - HTTP/1.1 400 Bad Request

I try to make a java WebDAV client, I work with Exchange 2000. 
I made a connection with sockets in Java:

Socket socket = new Socket("192.168.5.74", 80);

I took the OutputStream and I send the request.

When I make an xml request I become just "HTTP/1.1 400 Bad Request" response.
My request is like this:

PROPFIND /exchange/admin/Inbox/ HTTP/1.1
Host: 192.168.5.74
Connection: Keep-Alive
Content-type: text/xml; charset="utf-8"
Content-Length: 90
Accept-Language: en-us
Authorization: Basic YWRyYXRldXI6RERERVZYWA==

<?xml version="1.0" encoding="utf-8" ?>
<D:propfind xmlns:D="DAV:">
 <D:propname/>
</D:propfind>

Do I miss something ?