pan><span>(<span class="type-var">'b</span>, <span class="type-var">'err</span>)</span> <span class="xref-unresolved">Stdlib</span>.Result.t</span>)</span> <span class="arrow">&#45;&gt;</span></span>
  <span><span class="label">url</span>:string <span class="arrow">&#45;&gt;</span></span>
  <span><span class="type-var">'a</span> <span class="arrow">&#45;&gt;</span></span>
  <span><span><span><span class="type-var">'b</span> <a href="../index.html#type-result">result</a></span> option</span> <span class="xre