about pipelinning

I understand that HTTP request could be pipelined.
According to RFC2068 HTTP client can send multiple requests without
waiting for each response. But how can I discribe the request message?
I tried to following request,but failed. Please advice me.

GET A HTTP/1.1
Host: ...
GET B HTTP/1.1
Host: ...[enter][enter]

Received on Wednesday, 7 April 1999 02:14:44 UTC