d>
<td><code><a href="com/tencent/sonic/sdk/SonicSessionConnection.html#CUSTOM_HEAD_FILED_DNS_PREFETCH">CUSTOM_HEAD_FILED_DNS_PREFETCH</a></code></td>
<td class="colLast"><code>"sonic-dns-prefetch"</code></td>
</tr>
<tr class="rowColor">
<td class="colFirst"><a name="com.tencent.sonic.sdk.SonicSessionConnection.CUSTOM_HEAD_FILED_ETAG">
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</a><code>public&nbsp;static&nbsp;final&nbsp;java.lang.String</code></td>
<td><code><a href="com/tencent/sonic/sdk/SonicSessionConnection.html#CUSTOM_HEAD_FILED_ET