A web file is the same as a read-only TFile except that it is being read via a HTTP server. Make sure url is a valid TUrl object. If the file specified in the URL does not exist or is not accessible the kZombie bit will be set in the TWebFile object. Read specified byte range from remote file via HTTP daemon. This routine connects to the remote host, sends the request and returns the buffer.
Returns kTRUE in case of error.
Set position from where to start reading.