:bool</span> <span>&#45;&gt;</span> <span><span class="type-var">'a</span> Json_encoding.encoding</span> <span>&#45;&gt;</span> <span class="type-var">'a</span> <span>&#45;&gt;</span> string</code></dt><dt class="spec value" id="val-assemble"><a href="#val-assemble" class="anchor"></a><code><span class="keyword">val</span> assemble : <a href="index.html#type-base_url">base_url</a> <span>&#45;&gt;</span> string <span>&#45;&gt;</span> string <span>&#45;&gt;</span> <a href="index.html#type-url">url</a></code><