-# http\Message http\Message::toCallback(callable $callback[, int $offset = 0[, int $maxlen = 0]])
+# http\Message http\Message::toCallback(callable $callback)
Stream the message through a callback.
* callable $callback
The callback of the form function(http\Message $from, string $data).
-* Optional int $offset = 0
- Start to stream from this offset.
-* Optional int $maxlen = 0
- Stream at most $maxlen bytes, or all if $maxlen is less than 1.
## Returns: