</table>
<p>The <code class="directive">DeflateBufferSize</code> directive specifies
the size in bytes of the fragments that zlib should compress at one
- time.</p>
+ time. If the compressed response size is bigger than the one specified
+ by this directive then httpd will switch to chunked encoding
+ (HTTP header <code>Transfer-Encoding</code> set to <code>Chunked</code>), with the
+ side effect of not setting any <code>Content-Length</code> HTTP header. This is particularly
+ important when httpd works behind reverse caching proxies like Varnish or when httpd is configured with
+ <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> and <code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code> because
+ HTTP responses without any <code>Content-Length</code> header might not be cached.
+ </p>
</div>
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</variants>