Document the type of responses which contain content-md5.
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@79082
13f79535-47bb-0310-9956-
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Note that this can cause performance problems on your server
since the message digest is computed on every request
-(the values are not cached).
+(the values are not cached).<P>
+
+<code>Content-MD5</code> is only sent for documents served by the
+core, and not by any module. For example, SSI documents, output from
+CGI scripts, and byte range responses do not have this header.
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