Regenerate proxy.md

Author: elliottt

proxy.md

@@ -755,6 +755,18 @@ syntactically invalid, or if a header was forbidden.</p>
 <ul>
 <li><a name="method_fields.get.0"></a> list&lt;<a href="#field_value"><a href="#field_value"><code>field-value</code></a></a>&gt;</li>
 </ul>
+<h4><a name="method_fields.has"><code>[method]fields.has: func</code></a></h4>
+<p>Returns <code>true</code> when the key is present in this <a href="#fields"><code>fields</code></a>. If the key is
+syntactically invalid, <code>false</code> is returned.</p>
+<h5>Params</h5>
+<ul>
+<li><a name="method_fields.has.self"><code>self</code></a>: borrow&lt;<a href="#fields"><a href="#fields"><code>fields</code></a></a>&gt;</li>
+<li><a name="method_fields.has.name"><code>name</code></a>: <a href="#field_key"><a href="#field_key"><code>field-key</code></a></a></li>
+</ul>
+<h5>Return values</h5>
+<ul>
+<li><a name="method_fields.has.0"></a> <code>bool</code></li>
+</ul>
 <h4><a name="method_fields.set"><code>[method]fields.set: func</code></a></h4>
 <p>Set all of the values for a key. Clears any existing values for that
 key, if they have been set.</p>