Mom-Stompl-Patterns-Basic.html#v:reply">reply</a></code>)
</li><li> [<code>Header</code>]: Additional headers (passed to <code><a href="Network-Mom-Stompl-Patterns-Basic.html#v:reply">reply</a></code>)
</li><li> <code>Message</code> i -&gt; IO o: The core of the reply function:
                          transforming a request of type <em>i</em>
                          into a reply of type <em>o</em>
</li><li> <code>ReaderDesc</code> i: The reader through which requests are expected;
</li><li> <code>Writer