code: func (r FutureGetCFilterHeaderResult) Receive() (*wire.MsgCFHeaders, error) {
  	res, err := receiveFuture(r)
  	if err != nil {
  		return nil, err
  	}
  
  	// Unmarshal result as a string.
  	var headerHex string
  	err = json.Unmarshal(res, &headerHex)
  	if err != nil {
  		return nil, err
  	}
  
  	// Assign the decoded header into a hash
  	headerHash, err := chainhash.NewHashFromStr(headerHex)
  	if err != nil {
  		return nil, err
  	}
  
  	// Assign the hash to a headers message and return it.
  	msgCFHeaders := wire.MsgCFHeaders{PrevFilterHeader: *headerHash}
  	return &msgCFHeaders, nil
  
  }
docs: // Receive waits for the response promised by the future and returns the raw
  // filter header requested from the server given its block hash.