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  27 <a name="beast.ref.boost__beast__http__message.prepare_payload"></a><a class="link" href="prepare_payload.html" title="http::message::prepare_payload">http::message::prepare_payload</a>
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  29 <p>
  30           <a class="indexterm" name="idm45873495038272"></a>
  31 Prepare the message payload fields for the
  32           body.
  33         </p>
  34 <h6>
  35 <a name="beast.ref.boost__beast__http__message.prepare_payload.h0"></a>
  36           <span class="phrase"><a name="beast.ref.boost__beast__http__message.prepare_payload.synopsis"></a></span><a class="link" href="prepare_payload.html#beast.ref.boost__beast__http__message.prepare_payload.synopsis">Synopsis</a>
  37         </h6>
  38 <pre class="programlisting"><span class="keyword">void</span>
  39 <span class="identifier">prepare_payload</span><span class="special">();</span>
  40 </pre>
  41 <h6>
  42 <a name="beast.ref.boost__beast__http__message.prepare_payload.h1"></a>
  43           <span class="phrase"><a name="beast.ref.boost__beast__http__message.prepare_payload.description"></a></span><a class="link" href="prepare_payload.html#beast.ref.boost__beast__http__message.prepare_payload.description">Description</a>
  44         </h6>
  45 <p>
  46           This function will adjust the Content-Length and Transfer-Encoding field
  47           values based on the properties of the body.
  48         </p>
  49 <h6>
  50 <a name="beast.ref.boost__beast__http__message.prepare_payload.h2"></a>
  51           <span class="phrase"><a name="beast.ref.boost__beast__http__message.prepare_payload.example"></a></span><a class="link" href="prepare_payload.html#beast.ref.boost__beast__http__message.prepare_payload.example">Example</a>
  52         </h6>
  53 <pre class="programlisting"><span class="identifier">request</span><span class="special">&lt;</span><span class="identifier">string_body</span><span class="special">&gt;</span> <span class="identifier">req</span><span class="special">{</span><span class="identifier">verb</span><span class="special">::</span><span class="identifier">post</span><span class="special">,</span> <span class="string">"/"</span><span class="special">};</span>
  54 <span class="identifier">req</span><span class="special">.</span><span class="identifier">set</span><span class="special">(</span><span class="identifier">field</span><span class="special">::</span><span class="identifier">user_agent</span><span class="special">,</span> <span class="string">"Beast"</span><span class="special">);</span>
  55 <span class="identifier">req</span><span class="special">.</span><span class="identifier">body</span><span class="special">()</span> <span class="special">=</span> <span class="string">"Hello, world!"</span><span class="special">;</span>
  56 <span class="identifier">req</span><span class="special">.</span><span class="identifier">prepare_payload</span><span class="special">();</span>
  57 </pre>
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