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<h1>Glossary<a class="headerlink" href="#glossary" title="Permalink to this headline">¶</a></h1>
<dl class="glossary simple">
<dt id="term-metadatum">metadatum</dt><dd><p>A key-value pair included in the HTTP header.  It is a
2-tuple where the first entry is the key and the
second is the value, i.e. (key, value).  The metadata key is an ASCII str,
and must be a valid HTTP header name.  The metadata value can be
either a valid HTTP ASCII str, or bytes.  If bytes are provided,
the key must end with ‘-bin’, i.e.
<code class="docutils literal notranslate"><span class="pre">('binary-metadata-bin',</span> <span class="pre">b'\\x00\\xFF')</span></code></p>
</dd>
<dt id="term-metadata">metadata</dt><dd><p>A sequence of metadatum.</p>
</dd>
<dt id="term-serializer">serializer</dt><dd><p>A callable function that encodes an object into bytes. Applications are
allowed to provide any customized serializer, so there isn’t a restriction
for the input object (i.e. even <code class="docutils literal notranslate"><span class="pre">None</span></code>). On the server-side, the
serializer is invoked with server handler’s return value; on the
client-side, the serializer is invoked with outbound message objects.</p>
</dd>
<dt id="term-deserializer">deserializer</dt><dd><p>A callable function that decodes bytes into an object. Same as serializer,
the returned object doesn’t have restrictions (i.e. <code class="docutils literal notranslate"><span class="pre">None</span></code> allowed). The
deserializer is invoked with inbound message bytes on both the server side
and the client-side.</p>
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