code: func (c *Client) GetMetadataURL(stream string) (string, *Response, error) {
  
  	url, err := c.GetFeedPath(stream, "forward", 0, 1)
  	if err != nil {
  		return "", nil, err
  	}
  
  	f, resp, err := c.ReadFeed(url)
  	if err != nil {
  		return "", resp, err
  	}
  	for _, v := range f.Link {
  		if v.Rel == "metadata" {
  			return v.Href, resp, nil
  		}
  	}
  	return "", resp, nil
  }
docs: // GetMetadataURL gets the url for the stream metadata.
  // according to the documentation the metadata url should be acquired through
  // a query to the stream feed as the authors of GetEventStore reserve the right
  // to change the url.
  // http://docs.geteventstore.com/http-api/latest/stream-metadata/