[ Version ( since = "0.3" ) ]
public virtual bool expand (uint8[] buffer, Cancellable? cancellable = null) throws IOError
Expand a buffer into the response body.
If the content length can be determine reliably (eg. no 'Content-Encoding' applied), it will be set as well.
This function accept empty buffers, which result in an explicit 'Content-Length: 0' header and an empty payload.